Leaders of Never Before Seen Civs (Feel free to criticise me for calling certain non-agricultural/non-city building groups "Civs" 
):
Aceh (unlikely option with Indonesia in the game, but the Acehnese are interesting people, linguistic relatives of the Cham of Champa)
Alauddin al-Kahar
Ali Mughayat Syah
Cut Nyak Dhien
Iskandar Muda
Adiabene (unlikely)
Helena of Adiabene
Izates bar Monobaz
Monobaz II
Afar(unlikely choice, Ethiopia has a higher chance of getting in)
Alimirah Hanfare
Afghanistan (currently
Kabul CS) (currently on my wishlist, either Ahmad Shah Durrani or Mirwais Hotak would be fine with me)
Abdur Rahman Khan
Ahmad Shah Durrani
Amanullah Khan
Ayub Khan
Dost Mohammad Khan
Habibullah Khan
Mahmud Hotak
Mirwais Hotak
Mohammed Nadir Shah
Mohammed Zahir Shah
Soraya Tarzi
Ahom (unlikely to be added, due to India)
Gadadhar Singha
Sudangphaa
Suhungmung
Sukaphaa
Sukhrungphaa
Susenghphaa
Susenphaa
Sutanphaa
Ainu (probably doesn't count as a Civ to many here, but they are a really unique people)
Koshamain
Shakushain
Akkad (currently
Akkad CS) as notable a leader as Sargon is, Babylon and maybe even Assyria will probably be added eventually)
Naram-Sin
Sargon
Albania (unique language, but is less likely than other Balkan options)
Skanderbeg
Zog I
Algeria (I prefer Morocco to return)
Abdelkader
Ahmed Ben Bella
Lalla Fatma N'Soumer
Oruc Reis
Anglo-Saxons (for those who want them separate from England)
Aethelwealh of Sussex
Aethelwulf
Alfred the Great
Caedwalla of Wessex
Cenwalh of Wessex
Ecgberht, King of Wessex
Edward the Elder
Ine of Wessex
Saebbi of Essex
Saeberht of Essex
Sigeberht the Good
Angola (it's on my list as Ndongo, Anna Nzinga is pretty much the only notable leader though, she's already a Great General in Civ6)
Agostinho Neto
Anna Nzinga
Anishinaabe (Odawa/Potawatomi/Ojibwe) (These three Northeastern Amerindian peoples are related culturally and linguistically, they have less chance of making it due to the Cree)
Beautifying Bird
Black Partridge
Cobmoosa
Egushawa
Hole in the Day
Kechewaishke
Kineubenae
Main Poc
Menominee
Pontiac
Shabbona
Shingwauk
Waubonsie
Apache (a pretty famous name, but not my first pick for an Amerindian people to represent the American Southwest, they are not descendants of the Ancestral Puebloans)
Cochise
Geronimo
Loco
Lozen
Mangas Coloradas
Naiche
Nana
Taza
Victorio
Aragon (folded into Spain probably)
Alfonso the Battler
Ferdinand II
James I
Peter III
Arakan (less likely than a Burma Civ)
Ba Saw Phyu
Min Bin
Min Khayi
Min Phalaung
Min Razagyi
Min Saw Mon
Arapaho (Great Plains Amerindians, less likely than the Sioux)
Little Raven
Arawak/Taino (currently
Caguana CS) on my wishlist, Anacaona is my pick for leader, despite the lack of info on her life, Taino language is poorly attested though)
Agueybana I
Agueybana II
Anacaona
Enriquillo
Hatuey
Jumacao
Argentina (currently
Buenos Aires CS) (I'm not too big on adding more post-colonial nations to Civ6)
Arturo Umberto Illia
Carlos Pellegrini
Domingo Faustino Sarmiento
Eva Peron
Jose de San Martin
Juan Manuel de Rosas
Juan Peron
Julio Argentino Roca 
Armenia (currently
Yerevan CS) (on my wishlist, either it or Georgia should represent the Caucasus region, my pick for leader is Tigranes II)
Erato
Leo I
Tigranes II
Tiridates III
Vramshapuh
Ashanti (currently
Kumasi CS) (on my wishlist, my pick for leader is Yaa Asantewaa)
Opoku Ware I
Osei Bonsu
Osei Kofi Tutu I
Prempeh I
Yaa Asantewaa
Avar (not to be confused with the Pannonian Avars, these are the Caucasian Avars, highly unlikely choice due to Georgia
)
Imam Shamil
Axum (has been folded into Ethiopia for two games already, Ge'ez is cool language though)
Ezana
Kaleb
Aymara (highly unlikely with the Inca)
Bartolina Sisa
Tupac Katari
Azande (probably too similar to the Zulu, the Azande are a Central African people)
Gbudwe
Azerbaijan (highly unlikely due to Georgia
)
Rasulzade
Bactria (unlikely, since it's another Hellenic Civ, I like their art though)
Demetrius I
Eucratides I
Menander I
Baguirmi (Central African
sultanate, their language is probably too obscure)
Gaourang II
Bakweri (Central African people, unlikely)
Chief Kuva Likenye
Bali (folded into Indonesia)
Dalem Baturenggong
Mahendradatta
Bamum (Central African people who had a
Kingdom, unlikely)
Ibrahim Njoya
Bangladesh (modern South Asian nation, unlikely, plus it has only existed since the 1970s)
Sheikh Mujibur Rahman
Baoule (West African people, related to the Ashanti, unlikely)
Queen Pokou
Batak (folded into Indonesia?, people might not like cannibal Civs)
Sisingamangaraja XII
Belgium (currently
Brussels CS) (I'm not too interested in them becoming an official Civ, since we have the Netherlands)
Albert I
Ambiorix (he probably makes more sense as a Celtic leader though....)
Charles Rogier
Leopold I
Leopold II (might be too controversial
)
Benin (on my wishlist, my pick for leader is Idia, though Ewuare is fine as well)
Ewuare
Idia
Ozolua
Bengal (
link, folded into India?)
Alauddin Husain Shah
Beothuk (a very unlikely choice, because people consider them a non-Civ and the Beothuk language is poorly attested, their fate was tragic
)
Nonosbawsut
Berbers (suggested as an alternate to Morocco, people might consider them a non-Civ)
Dihya
Kusaila
Tacfarinas
Tin Hinan
Beti-Pahuin (ethnic group in Central Africa, unlikely)
Charles Atangana
Bhutan (a substitute for Tibet?
, I would like a Thimphu City-state though)
Jigme Wangchuck
Jigme Dorji Wangchuck
Jigme Palden Dorji
Ugyen Wangchuck
Blackfoot (
link, Great Plains Amerindian people, less likely than the Sioux)
Aatsista-Mahkan
Crowfoot
Running Eagle
Boers (they dominated a Civ5 Battle Royale, but would their inclusion cause controversy?
)
Andries Pretorius
Hendrik Potgieter
Louis Botha
Paul Kruger
Piet Joubert
Piet Retief
Sarel Cilliers
Bolivia (less likely than Argentina and Gran Colombia)
Belzu
Bosnia (less likely than Serbia to appear)
Kulin
Stephen II
Tvrtko I
Botswana (less likely than the Zulu)
Khama III
Seretse Khama
Britons (unlikely due to Gaul appearing in Civ6)
Boudica
Caratacus
Cartimandua
Cassivellaunus
Cunobeline
Brittany (folded into the Celts in Civ5)
Anne
Joanna of Flanders
Nominoe
Brunei (currently
Bandar Brunei CS) (unlikely due to Indonesia)
Bolkiah
Bubi (
link, Central African people, unlikely)
Malabo Lopelo Melaka
Buganda (unlikely, but probably the best choice to represent the African Great Lakes region)
Muteesa I
Mwanga II
Bulgaria (currently
Preslav CS) (on my wishlist, my pick for leader is Simeon)
Asparukh
Boris I
Ferdinand I
Ivan Asen II
Krum
Peter IV
Samuel
Simeon
Vasil Levski
Burgundy (folded into France?)
Charles the Bold
Philip the Good
Burundi (unlikely, not much is known about Cambarantama)
Cambarantama
Cahuilla (unlikely, Californian Amerindian people, let's face it, the Californian natives aren't famous and would not fit the traditionalist definition of a Civilization)
Juan Antonio
Calusa (Floridian Amerindian people, highly unlikely, due to lack of language attestation, their fate was tragic
)
Caalus
Caracas (highly unlikely, Caracas language is unattested, their fate was tragic
)
Caricuao
Guaicaipuro
Caribs (highly unlikely Caribbean/Northern South Amerindian people, portray their ancestors as cannibals and you will offend them)
Kairouane
Catawba (unlikely, Southeast Amerindian people, language has been extinct for more than half a century)
King Hagler
Caxcan (highly unlikely, Cazcan language is poorly attested)
Francisco Tenamaztle
Central America (less likely than Mexico)
Francisco Morazan
Chagga (
link, East African people, unlikely)
Thomas Marealle
Chamorro (indigenous people of Guam and Marianas Islands, unlikely)
Kepuha
Champa (their land is now Southern Vietnam, info on their leaders is lacking)
Bhadravarman I
Che Bong Nga
Jaya Indravarman IV
Cherokee (famous, mainly due to the Trail of Tears, their most prominent leaders sold out the interest of their people to relocate to Oklahoma)
Attakullakulla
Black Fox
Doublehead
Dragging Canoe
John Ross
Nanyehi
Oconostota
Ostenaco
Stand Watie
The Bowl
Yonaguska
Cheyenne (
link, Great Plains Amerindian people, less likely to appear than the Sioux, the Dog Soldier unit of Civ4's Native America Civ is theirs)
Black Kettle
Hook Nose
Little Wolf
Morning Star
Owl Woman
Two Moons
Chickasaw (Southeast Amerindian people, less likely than the Cherokee)
Tishomingo
Chile (less likely than Argentina, and you know my opinion on more post-colonial Civs)
Bernardo O'Higgins
Chimu (on my wishlist, very unlikely choice due to lack of info on their leaders, language is also not as well documented as say Quechua)
Minchacaman
Nancen-pinco
Tacaynamo
Chinook (
link, PNW Amerindian people, unlikely)
Comcomly
Chiwere (Iowa, Missouria, Otoe) (these three Great Plains Amerindian peoples are related linguistically, unlikely)
Mahaska
Choctaw (on my wishlist, SE Amerindian people, Pushmataha is my leader choice)
Apuckshunubbee
Mushulatubbee
Pushmataha
Red Shoes
Chola (folded into India, Rajendra Chola is a Great Admiral currently)
Kulottunga I
Raja Raja Chola I
Rajadhiraja Chola
Rajendra Chola I
Chorotega (Central Amerindian people, their language is extinct, unlikely)
Diriangen
Chukchi (
link, Siberian people, unlikely)
Eyhell
Chumash (California Amerindian people, unlikely, but I'm interested in their art and tomol boats)
El Buchón
Pacomio
Rafael Solares
Yanonali (
depiction)
Circassia (Caucasian people, unlikely)
Tuguzhuko Kyzbech
Colombia (less likely than Gran Colombia)
Rafael Nunez
Comanche (fairly well-known Great Plains Amerindian people, the unique unit of the Shoshone in Civ5 was a Comanche Rider)
Amorous Man
Big Red Meat
Buffalo Hump
Horseback
Iron Jacket
Isatai'i
Mow-way
Old Owl
Quanah Parker
Ten Bears
Cordoba/Al-Andalus/Moors (currently
Granada CS) (less likely than Morocco, overlap with Spain in the City-list)
Abd-ar-Rahman III
Almanzor
Cornwall (folded into Celts in Civ5)
Michael an Gof
Corsica (folded into France?)
Pasquale Paoli
Cossack Hetmanate (less likely with Russia in the game)
Bohdan Khmelnytsky
Costa Rica (Central American nation, seems unlikely)
Juan Rafael Mora Porras
Courland and Semigallia (unlikely, Baltic Duchy)
Jacob Kettler
Creek/Muscogee (on my wishlist, either they or the Choctaw representing the Amerindians of the American Southeast is fine by me)
Alexander McGillivray
Chitto Harjo
Estajoca
Isparhecher
Menawa
Opothleyahola
Osceola
Red Eagle
Tomochichi
William McIntosh
Croatia (less likely than Serbia to represent the Yugoslav region)
Peter Kresimir IV
Tomislav
Crow (
link, Great Plains Amerindian people, less likely than the Sioux)
Plenty Coups
Cuba (a popular choice to represent the Caribbean, Fidel Castro is probably off-limits though)
Carlos Manuel de Cespedes
Jose Marti
Cumans (
link, Turkic Central Asian people, unlikely due to Scythia)
Konchak
Cyprus (unlikely, Hellenic Civ)
Evagoras I
Onesilus
Czechia/Bohemia (on my wishlist, my pick for leader is either Ottokar II or Charles IV)
Boleslaus I
Charles IV
George of Podebrady
John the Blind
Ottokar I
Ottokar II
Tomas Garrigue Masaryk
Vaclav Havel
Wenceslaus I, Duke of Bohemia
Wenceslaus II
Dacia (pre-Roman people of present-day Romania, Dacian language is poorly documented)
Burebista
Decebalus
Dagbon (West African
Kingdom, less likely than the Ashanti)
Darimani
Na Gbewa
Dahomey (on my wishlist, either it, Benin or Ashanti could represent the West African coast, my pick for their leader is Ghezo)
Agaja
Behanzin
Ghezo
Dayak (indigenous people of Borneo, unlikely)
Rentap
Dene (a blob-Civ, Subarctic Amerindian peoples, people would object to the leader choice
)
Thanadelthur
Dhegihan (Kansa, Osage, Omaha, Ponca, Quapaw) (these five Great Plains Amerindian people are related linguistically, unlikely)
Standing Bear
White Plume
Dominican Republic (less likely than Cuba)
Juan Pablo Duarte
Duala (
link, Central African people, unlikely)
Ndumbe Lobe Bell
Ebla (ancient Semitic people who lived in present-day Syria, unlikely)
Irkab-Damu
Elam (ancient people in what is now modern-Iran, unlikely)
Kutik-Inshushinak
Shutruk-Nakhunte
Untash-Napirisha
Eora (Australian Aboriginal people, a lot of Civ fans would object to their inclusion, not to mention Aboriginal elders objecting to the depiction of their ancestors)
Bennelong
Pemulwuy
Etruscans (ancient pre-Roman people of the Italian peninsula, language is attested, but hard to comprehend)
Tarchon
Tyrrhenus
Evenks (
link, Tungusic Siberian people, unlikely)
Bombogor
Faroe Islands (unlikely, we have Norway)
Trondur i Gotu
Fatimids (
link, folded into Arabia)
Al-Mu'izz li-Din Allah
Fiji (Melanesian nation, portraying them as cannibals would offend them)
Seru Epenisa Cakobau
Finland (a semi-popular Civ idea, but I'm not enthusiastic, since their most notable leaders are from the 20th Century, fascinating language though)
Carl Gustaf Emil Mannerheim
Urho Kekkonen
Flanders (would probably be folded into Belgium)
Robert III
Fox & Sauk (
Sauk and
Meskwaki/Fox are related Northeast Amerindian peoples, unlikely)
Black Hawk
Franks (Charlemagne was the leader of the Holy Roman Civ in Civ4, but I prefer the Civ to be renamed the Franks if they had to be added, might cause confusion with France)
Charlemagne
Fredegund
Fulani (
link, widespread West African peoples, less likely than Mali/Songhai)
Modibo Adama
Seku Amadu
Usman dan Fodio
Galicia/Suebi (NW Iberian Peninsula, unlikely, Suebi language in unattested)
Ariamir
Hermeric
Miro
Rechiar
Rechila
Remismund
Theodemar
Ghana (modern West African nation, unlikely)
Kwame Nkrumah
Gokturks (
link, Turkic people, less likely due to Scythia/Mongolia)
Bumin Qaghan
Tong Yabghu Qaghan
Golden Horde (
link, presumably folded into Mongolia)
Oz Beg Khan
Goths (East Germanic people who ruled Iberian and Italian peninsulas, enough of Gothic language has survived for basic dialogue)
Alaric I
Liuvigild
Theoderic
Totila
Great Moravia (
link, less likely to happen than Bohemia though)
Rastislav
Svatopluk I
Greenland (unlikely, folded into Norway)
Erik the Red
Guale (highly unlikely, SE Amerindian people, their language is unattested)
Juanillo
Guanche (indigenous people of the Canary Islands, language is poorly attested)
Tinerfe
Guarani (their tongue is an official language and widely spoken in Paraguay)
Sepe Tiaraju
Guaymi/Ngäbe (Central Amerindian people, unlikely)
Urracá
Haida (on my wishlist as a possible PNW civ, seems unlikely due to lack of info on their leaders, Haida is an endangered language)
Albert Edward Edenshaw
Chief Weah
Cumshewa
Koyah
Skidegate the Great
Skidegate the Very Great
Haiti (less popular than Cuba as a post-colonial Caribbean Civ, culture is interesting though)
Toussaint Louverture
Hausa (on my wishlist, Amina would be the leader, despite a lack of surviving info on her)
Amina
Muhammad Rumfa
Sarraounia Mangou
Yaji I
Hawaii (on my wishlist, as a possible alternative to Polynesia)
Ka'ahumanu
Kalakaua
Kamehameha I
Kamehameha II
Kamehameha III
Kamehameha IV
Kamehameha V
Liliuokalani
Lunalilo
Hehe (
link, East African people, unlikely)
Chief Mkwawa
Hmong (Mainland SE Asian peoples, unlikely)
Touby Lyfoung
Ho-Chunk (
link, Northeast Amerindian people, unlikely)
Waukon Decorah
Honduras (Central American nation, unlikely)
Marco Aurelio Soto
Hopi (Puebloan SW Amerindian people, I remember Firaxis' attempt to add the Puebloans as a Civ for BNW, so they seem highly unlikely)
Lomahongyoma
Loololma
Nakwaiyamtewa
Tewaquaptewa
Tuba
Yokioma
Huarpe (Southern Cone Amerindian people, their languages are extinct)
Cacique Angaco
Huron (Northeast Amerindian people, linguistic kin to the Iroquois, their language is extinct)
Kondiaronk
Iberia (pre-Roman people of Eastern Iberian peninsula, their extinct language is poorly understood)
Indibilis
Iceland (folded into Norway)
Ingolfr Arnarson
Snorri Sturluson
Igbo (
link, major West African ethnic group in present-day Nigeria)
Eri
Eze Ukwu
Igwe Iwuchukwu Ezeifekaibeya
Igwe Orizu I
Ilkhanate (
link, they seem likely to be folded into Mongolia, and there's overlap with Persia)
Ghazan
Illyria (pre-Roman peoples of present-day Yugoslavic region, their languages are poorly attested)
Agron
Bardylis
Teuta
Inuit (very popular Civ idea, but the lack of well-attested historical leaders, along with objections to their inclusion for being hunter-gatherers)
Ekeuhnick
Iraq (unlikely choice, and folded into Arabia)
Faisal I
Ireland (currently
Armagh CS) (on my wishlist, my pick for leader is Brian Boru)
Brian Boru
Diarmait mac Mael na Mbo
Éamon de Valera
Grace O'Malley
Mael Sechnaill mac Maele Ruanaid
Malachy II
Michael Collins
Isle of Man (unlikely to be added as their own Civ, was folded into Celts in Civ5)
Illiam Dhone
Orry
Israel/Judea/Hebrews (currently
Jerusalem CS) (unlikely to be added by Firaxis for obvious reasons)
Alexander Jannaeus
David
David Ben-Gurion
Deborah
Golda Meir
Herod the Great
Hezekiah
Jehu
John Hyrcanus
Judas Maccabeus
Levi Eshkol
Matityahu
Menachem Begin
Salome Alexandra
Saul
Shimon Peres
Solomon
Yitzhak Rabin
Italy (currently
Bologna CS) on my wishlist, my pick for leader is Lorenzo de Medici)
Andrea Doria
Battista Sforza
Camillo Benso, Count of Cavour
Caterina Sforza
Enrico Dandolo
Federico da Montefeltro
Ferdinand I
Francesco I Sforza
Francesco Crispi
Gian Galeazzo Visconti
Giuseppe Garibaldi
Gregory XIII
Innocent III
Lorenzo de Medici
Ludovico Sforza
Margherita of Savoy
Matilda of Tuscany
Odoacer
Pius IX
Pope Alexander VI
Pope Urban VIII
Simone Boccanegra
Victor Emmanuel II
Victor Emmanuel III
Ivory Coast (unlikely, post-Colonial West African nation)
Felix Houphouet-Boigny
Jamaica (Caribbean Island nation, unlikely)
Alexander Bustamante
Marcus Garvey
Michael Manley
Nanny of the Maroons
Norman Manley
Jerusalem (Crusader Kingdom) (some would like a Crusader Civ, I'm one of those who don't
)
Alice of Champagne
Baldwin IV
Peter I
Jolof Empire (
link, West African coastal state, unlikely)
Ndiadane Ndiaye
Kanem-Bornu (currently
Ngazargamu CS)
Kanem,
Bornu, two Central African empires in the same region, less likely than Mali/Songhai)
Dunama Dabbalemi
Idris Alooma
Karen (
link, Southeast Asian peoples, Myanmar Government wouldn't be pleased if they are added)
Saw Ba U Gyi
Kasanje (pre-colonial Central African state, unlikely)
Kasanje Kalunga
Kazakhs (Central Asian people, Firaxis might consider the region covered by Scythia and Mongolia)
Ablai Khan
Kazembe (
link, Southern African kingdom, unlikely)
Mwata Kazembe VII
Kenya (modern East African nation, unlikely)
Jaramogi Oginga Odinga
Jomo Kenyatta
Khasi (NE Indian people, unlikely)
Tirot Sing
Khazaria (
link, Central Asian Turkic people, their language is poorly attested)
Aaron II
Bulan
Joseph
Khoikhoi (Southern African people, many don't consider them a Civ, so unlikely)
Hendrik Witbooi
Kickapoo (
link, Northeast Amerindian people, unlikely)
Kennekuk
Kikuyu (
link, East African people, unlikely)
Dedan Kimathi
Kimberley (not a single Australian Aboriginal people, but multiple in a region of Australia, see Eora above)
Jandamarra
Kiowa (
link, Great Plains Amerindian people, unlikely)
Dohasan
Sitting Bear
Kong Empire (
link, West African state, unlikely)
Seku
Koryaks (Siberian peoples, unlikely)
Lawtylywalyn
Kuikuro (
link, Amazonian people, unlikely, but I enjoyed the Civ5 mod)
Hikutaha
Kulin (
link, Australian Aboriginal peoples, see Eora above)
William Barak
Kuna/Guna (
link, Central Amerindian people, unlikely)
Nele Kantule
Kurds (
link, adding them would cause controversy)
Barzanji
Kushan (
link, interesting Central/South Asian empire, could be considered Hellenic though
)
Kanishka
Kyrgyzstan (Central Asian nation, unlikely)
Kurmanjan Datka
Laos (less likely to be added due to the Khmer)
Setthathirath
Latvia (unlikely, modern Baltic nation)
Janis Cakste
Lebanon (modern Middle Eastern nation, unlikely)
Fakhr-al-Din II
Lenape (
link, Northeast Amerindian people, unlikely, but close to my heart)
Buckongahelas
Teedyuscung
Lenca (
link, Central Amerindian people, unlikely, languages are extinct)
Lempira
Lesotho (Southern African nation, less likely than the Zulu)
Moshoeshoe I
Liberia (modern West African nation, unlikely)
William Tubman
Limba (
link, West African people, unlikely)
Almamy Suluku
Lithuania (currently
Vilnius CS) (I've no problem with them being added, but Poland's ability references them)
Gediminas
Jogaila
Mindaugas
Vytautas
Livonia (
link, Baltic region/people, unlikely)
Albert of Riga
Lombards (Germanic people who settled in Italy after the fall of the Western Roman empire, language is poorly attested)
Alboin
Liutprand
Theodelinda
Lozi (Southern African people, unlikely)
Mwanasolundwi
Luba (
link, Central African state, less likely due to Kongo)
Ilunga Sungu
Kalala Ilunga
Luhya (
link, East African people, unlikely)
Nabongo Mumia
Lunda (Central African state, unlikely)
Mwata Yamvo
Lusitania (pre-Roman people of Western Iberian peninsula, language is poorly attested)
Viriathus
Luxembourg (unlikely due to Netherlands)
Ermesinde
Lycia (
link, ancient Anatolian people, could count as Hellenic Civ, so unlikely)
Ptolemy II of Telmessos
Lydia (
link, ancient Anatolian people, could count as a Hellenic Civ)
Croesus
Maasai (
link, East African people, unlikely)
Mbatian
Madagascar (currently
Antananarivo CS) (on my wishlist, Ranavalona I is my pick for leader
)
Andriamanelo
Andriamasinavalona
Andrianampoinimerina
Andrianjaka
Radama I
Ralambo
Ranavalona I
Malaysia (unlikely due to Indonesia, their cities aren't in the Indonesian City-list though)
Abu Bakar of Johor
Bhagadatta
Daeng Parani
Merong Mahawangsa
Parameswara
Maldives (seems highly unlikely)
Khadijah
Malta (Valletta City-State, unlikely)
Jean Parisot de Valette
Mamluk Sultanate (folded into Arabia, their unique unit is a Mamluk)
Baibars
Manchu (would the Chinese government care about a separate Manchu Civ?)
Hong Taiji
Nurhaci
Mandan (Great Plains Amerindian people, unlikely)
Four Bears
Maratha (folded into India)
Shivaji Bhonsle
Yashwantrao Holkar
Mari (
link, ancient Semitic city-state in present day Syria, unlikely)
Zimri-Lim
Mariche (highly unlikely, Mariche language is unattested)
Tamanaco
Matebeleland (
link, Southern African kingdom, leader could be an alternative to Shaka, but unlikely)
Mzilikazi
Mendeland (
link, West African people, unlikely)
Ndawa
Menominee (
link, Northeast Amerindian people, unlikely)
Chief Oshkosh
Métis (mixed First Nation-French people, unlikely)
Louis Riel
Mexico (currently
Mexico City CS) popular post-colonial nation choice, some might consider it covered by the Aztecs)
Benito Juarez
Emiliano Zapata
Guadalupe Victoria
Porfirio Diaz
Miami-Illinois (
Miami,
Illinois confederation, Northeast Amerindian peoples, unlikely)
Little Turtle
Micronesia (currently
Nan Madol CS) (Nan Madol is the most interesting place in Micronesia, but lack of info on their languages is a deterrent to their inclusion)
Isokelekel
Olosohpa
Mijikenda (
link, East African coastal peoples, unlikely)
Mekatilili Wa Menza
Miskito (
link, Central Amerindian people, unlikely)
Jeremy I
Oldman
Mississippians (currently
Cahokia CS) would be a shoo-in if we knew about their greatest leaders, but alas, they would be a blob-Civ since they consisted of different linguistic/ethnic groups.
Casqui
Great Sun
Quigualtam
Tattooed Serpent
Tuskaloosa
Mitanni (
link, ancient Kingdom in the Fertile Crescent, unlikely)
Parshatatar
Miwok (
link, California Amerindian peoples, unlikely)
Chief Marin
Mixtec (
link, Mesoamerican people, unlikely due to the Aztecs)
Eight Deer Jaguar Claw
Modoc-Klamath (
Modoc,
Klamath, Amerindians of the Plateau/California regions, unlikely)
Kintpuash
Mohegan (
link, Northeast Amerindian people, unlikely)
Uncas
Mon/Hanthawaddy (
link, mainland SE Asian people, unlikely)
Camadevi
Manuha
Razadarit
Shin Sawbu
Montenegro (less likely than Serbia)
Petar II
Mordvins (
link, an indigenous people of Russia, unlikely)
Alena Arzamasskaia
Mossi (
link, West African people, less likely than Mali/Songhai)
Yennenga
Mughals (folded into India?, but popular Civ idea)
Akbar
Shah Jahan
Muisca (currently
Hunza CS) on my wishlist, Nemequene is my pick for leader)
Hunzahua
Nemequene
Saguamanchica
Munda (
link, indigenous people of India, unlikely)
Birsa Munda
Murri (
link, Australian Aboriginal peoples, see Eora above)
Gambu Ganuurru
Myanmar (on my wishlist, Bayinnaung is my pick for leader)
Alaungpaya
Anawrahta
Aung San
Bayinnaung
Hsinbyushin
Kyansittha
Mindon Min
Swa Saw Ke
Tabinshwehti
Thado Minbya
Thihathu
Mysore (
link, Southern Indian Kingdom, folded into India)
Tipu Sultan
Nabataea (
link, Levantine state, unlikely, Petra is already a World Wonder)
Aretas III
Obodas I
Nandi (
link, East African people, not to be confused with Shaka's mom, unlikely)
Koitalel Arap Samoei
Natchez (
link, Southeast Amerindian people, unlikely)
Tattooed Serpent
Navajo (well-known Amerindian people of SW, and a large nation, but I'm not enthusiastic about them being added, since they are not descendants of the Ancestral Puebloans)
Barboncito
Chee Dodge
Manuelito
Narbona
Nenets (
link, indigenous people of North-Central Russia, unlikely)
Vavlyo/Vaulli Piettomin
Nepal (could be a substitute for Tibet, I would not mind them becoming a Civ)
Pratap Malla
Prithvi Narayan Shah
New Zealand (currently
Auckland CS) (less likely due to Australia's inclusion, also I not fond of more post-colonial Civs)
Michael Joseph Savage
Richard Seddon
Nez Perce (
link, Plateau Amerindians, less likely)
Chief Joseph
Nicaragua (Central American nation, unlikely)
Augusto Cesar Sandino
Nigeria (modern West African nation, I prefer Benin to represent this area)
Obafemi Awolowo
Noongar (
link, on my wishlist
, Australian Aboriginal people, see Eora above)
Midgegooroo
Yagan
Numidia (
link, pre-Roman North African kingdom, Numidian language is poorly attested)
Jugurtha
Masinissa
Nuuchahnulth/Nootka (on my wishlist, as a possible PNW Civ
, see the Haida above)
Maquinna
Wickaninnish
Nyamwezi (
link, East African people, unlikely)
Mirambo
Omagua (
link, Amazonian people, unlikely)
Conori
Payoreva
Omaha (
link, Great Plains Amerindian people, see Dhegihan above)
Blackbird
Oman (currently
Muscat CS) (they ruled parts of the East African coast, but they seem less likely to become an actual Civ)
Saif Bin Sultan
O'odham (
Tohono O'odham,
Pima, Southwest Amerindian people, unlikely)
Luis Oacpicagigua
Ovambo (
link, Southern African people, unlikely)
Mandume Ya Ndemufayo
Paiute (Great Basin Native Americans, unlikely)
Wovoka
Pakistan (modern nation-state, unlikely)
Benazir Bhutto
Muhammad Ali Jinnah
Muhammad Zia-ul-Haq
Zulfikar Ali Bhutto
Palestine (as controversial a Civ choice as Israel)
Yasser Arafat
Palmyra/Aram (
link, often mentioned, but fan reception to its possible inclusion is divided)
Zenobia
Panama (Central American nation, unlikely)
Manuel Amador Guerrero
Paraguay (less likely than Argentina to appear)
Francisco Solano Lopez
Gaspar Rodriguez
Pawnee (
link, Great Plains Amerindian people, unlikely)
Petalesharo
Sharitahrish
Pechenegs (semi-nomadic Turkic people from Central Asia, unlikely)
Kurya
Pergamon (another Hellenic kingdom
)
Attalus I
Peru (less likely than Argentina to appear)
Micaela Bastidas
Ramon Castilla
Tomasa Tito Condemayta
Philippines (on my wishlist, my pick for leader is Dayang Kalangitan, many people are opposed to their inclusion, considering them a post-colonial nation, I'm more interested in their pre-Colonial past)
Corazon Aquino
Dayang Kalangitan
Emilio Aguinaldo
Jose Rizal
Lakandula
Lapu-Lapu
Manuel L. Quezon
Manuel Roxas
Muhammad Kudarat
Phrygia (
link, Anatolian kingdom, their language is not well-attested)
Midas
Picts (highly unlikely, more likely to be folded into the Celts like in Civ5, The Pictish language is poorly attested)
Bridei III
Causantin mac Fergusa
Oengus I
Pomo (
link, California Amerindian people, unlikely)
Essie Pinola Parrish
Pontus (
link, another Hellenic kingdom)
Mithridates VI
Powhatan (on my wishlist as an alternative to the Iroquois, Powhatan is my leader pick, the language is not that well-attested sadly
)
Cockacoeske
Opchanacanough
Powhatan
Puebloans (for those unaware, Firaxis was planning to put them in the BNW expansion for Civ5, the Puebloan council they contacted opposed their depiction in a game, and so they were replaced by the Shoshone, they would have been a blob-Civ)
Luis Tupatu
Popay
Tuba
Xauían
Puruha (
link, Ecuadorian Amerindian people, their pre-Quechua language is poorly attested)
Fernando Daquilema
Qiang (
link, ethnic group in present-day China, unlikely)
Yao Chang
Rapa Nui (currently
Rapa Nui CS) aka Easter Island, unlikely to be added as a Civ on their own, but the Moai statues may make a reappearance)
Hotu Matu'a
Romania (on my wishlist, Vlad III is my pick for leader
)
Alexandru Ioan Cuza
Basarab I of Wallachia
Bogdan I of Moldavia
Carol I
Ferdinand I of Romania
Ion Antonescu
Ion I. C. Bratianu
Michael the Brave
Mircea the Elder
Stephen III of Moldavia
Vlad III
Rwanda (
link, was a Kingdom before colonial rule, but seems unlikely)
Rwabugiri
Ryukyu (
link, was a Kingdom before falling under Japanese rule, seems unlikely)
Sho Hashi
Saba (
link, identified with the biblical land of Sheba, Sabaean language is actually decently well attested)
Karib'il Watar
Makeda
Samahu Ali
Safavids (
link, one of the greatest Iranian empires after the Islamic conquest of Persia)
Abbas I
Salish (
Coast Salish, a blob-Civ but one based on linguistics, PNW Amerindian peoples, see Haida above)
Chief Seattle
Leschi
Spokane Garry
Sami (indigenous peoples of Scandinavia)
Isak Saba
Lars Levi Læstadius
Svåse
Synnøve Svåsedotter
Samoa (Polynesian country, seem less likely to appear bc of the Maori)
Malietoa Laupepa
Malietoa Talavou Tanumaipe'a
Malietoa Tanumafili I
Malietoa Tanumafili II
Mata'afa Iosefo
Nafanua
Salamasina
Tui Manu'a Elisala
Tui Manu'a Matelita
Tupua Tamasese Lealofi III
Saxons (unlikely to be split off from Germany)
Widukind
Seleucids (
link, currently
Antioch CS) a Hellenistic successor state to Alexander's Empire)
Antiochus III
Seleucus
Seljuks (
link, Turko-Persian empire)
Alp Arslan
Seminole (
link, Southeast Amerindian people, a branch off of the Creek)
Micanopy
Osceola
Senegal/Serer (
link, I folded the West African people with the modern nation, less likely than Mali/Songhai)
Ama Joof
Leopold Sedar Senghor
Serbia (out of all the Yugoslavic Kingdoms, this one seems the most likely to be added to a Civ game)
Karadorde
Lazar
Peter I
Stefan Dusan
Stefan Nemanja
Stefan Uros I
Vlastimir
Vukan
Shan (
Shan states,
Shan people, Southeast Asian people, seems unlikely, because the Myanmar Government would be opposed)
Sawlon
Shawnee (
link, on my wishlist, Tecumseh is my pick for leader)
Blue Jacket
Cornstalk
Nonhelema
Tecumseh
Tenskwatawa
Sibir (
link, North-Central Russian state, has a likelier choice of being picked to represent Siberia than Chukchi, Evenks, Nenets etc)
Kuchum Khan
Sicily (
link, Norman founded, folded into an Italian Civ?)
Roger II
Sierra Leone (modern West African Civ, unlikely)
Milton Margai
Sikhs (
link, currently
Lahore CS) the only Civ that would found Sikhism, unlikely)
Ranjit Singh
Singapore (currently
Singapore CS) modern SE Asian nation, unlikely)
Lee Kuan Yew
Slavs (there are already 2 Slavic nations in Civ6)
Niklot
Samo
Sogdiana (
link, ancient Central Asian Iranian people, the language is moderately attested)
An Lushan
Divashtich
Gurak
Oxyartes
Roxana
Spitamenes
Tarkhun
Somalia (on my wishlist, don't be fooled by its recent history/political situation)
Ahmad ibn Ibrahim al-Ghazi
Mohammed Abdullah Hassan
South Africa (could this be a viable alternative to the Zulu? maybe after a 100 years....)
Nelson Mandela
South Sudan (modern Central African nation state, unlikely)
John Garang
Sri Lanka (currently
Kandy CS) (on my wishlist, Parakramabahu I is my pick for leader)
Devanampiya Tissa
Dhatusena
Dutugamunu
Gajabahu I
Lilavati
Mahasena
Pandukabhaya
Parakramabahu I
Valagamba
Vasabha
Sudan/Sennar (I folded
Mahdist Sudan with the
Sultanate of Sennar, both seem unlikely, with Nubia being in that region)
Amara Dunqas
Muhammad Ahmad
Osman Digna
Sulu (link, should this be folded into Philippines?, probably controversial in Malaysia)
Batarah Shah Tengah
Sunda (
link, probably folded into Indonesia)
Sri Baduga Maharaja
Swahili (currently
Zanzibar CS) (on my wishlist, but I might consider removing them, due to the lack of surviving info on their greatest rulers)
Al-Hasan ibn Sulaiman
Ali ibn al-Hassan
Barghash bin Said
Swaziland (unlikely due to the Zulus)
Labotsibeni Mdluli
Mswati II
Switzerland (currently
Geneva CS) (popular Civ idea, I'm not too fond of it, the leader choices don't interest me too much)
Alfred Escher
Guillaume-Henri Dufour
Henri Guisan
Huldrych Zwingli
Tahiti (less likely to appear than Hawaii, Samoa and Tonga)
Pomare I
Pomare IV
Purea
Tairona (
link, Amerindian people of coastal north Colombia, I would fold their descendants, including the
Kogi, and
Arhuaco, unlikely)
Cuchacique
Taiwan (I folded the
Taiwanese Aboriginals into them, but this becoming a Civ is impossible for geopolitical reasons)
Koxinga
Mona Rudao
Tanzania (modern East African nation, unlikely)
Julius Nyerere
Tarascan (
link, Mesoamerican state, unlikely due to lack of surviving info on its rulers)
Erendira Ikikunari
Tariacuri
Zuangua
Tatars (
Crimean Tatars, their inclusion as a Civ seems unlikely)
Tugay Bey
Tehuelche (
link, Patagonian Amerindian people, unlikely)
Casimiro Bigua
Temne (
link, West African people, unlikely)
Bai Bureh
Teotihuacan (
link, highly unlikely, due to their language being unknown)
Spearthrower Owl
Tepehuan (link, Aridomerican Amerindians, unlikely)
Quautlatas
Ternate (
link, highly unlikely, Ternate is a City-name in the Indonesian City-list)
Baabullah
Texas (once independent for a time, a highly unlikely choice)
Mirabeau B. Lamar
Sam Houston
Thrace (
Odrysian kingdom, Thracian language is poorly attested)
Sitalces
Three Affiliated Tribes (Mandan, Arikara, Hidatsa) (
Mandan,
Hidatsa,
Arikara, these three peoples of the Great Plains are united today, unlikely)
Mato-tope
Tibet (not happening due to geopolitical reasons
, but Songtsen Gampo is a Great Prophet)
Ngawang Lobsang Gyatso
Songtsen Gampo
Timoto-Cuica (
link, Amerindians of present day Venezuela, unlikely due to the Timotean languages being rather obscure and extinct)
Carachy
Timucua (
link, Amerindian people of Northern Florida, unlikely, but the Timucua language is attested, their fate, like that of the Calusa, was tragic
)
Saturiwa
Timurids (a popular Civ idea, but basically a one-man Civ)
Timur
Tiwanaku (pre-Inca Andean state, unlikely)
Huyustus
Tlaxcala (
link, folded into the Aztecs, but they helped the Spanish conquer them
)
Xicotencatl II
Tlingit (on my wishlist as a possible PNW civ, see the Haida above)
Chief Katlian
Koh'Klux link link link
Sheiyksh I
Xet-su-wu (page 44)
Toba (
link, Amerindian people of Gran Chaco, unlikely)
Yaloschi
Toltecs (pre-Aztec Mesoamerican people, unlikely)
Xochitl
Tonga (
Tu'i Tonga Empire)
'Aho'eitu
Aleamotu'a
George Tupou I
George Tupou II
Laufilitonga
Momo of Tonga
Salote Tupou III
Talatama
Taufa'ohau Tupou IV
Tu'i-ta-tui
Tuku'aho
Tupoumoheofo
ʻUluakimata I
Tongva (
link, Amerindian people of South California, unlikely)
Toypurina
Tonkawa (
link, Amerindians of the Great Plains, unlikely, their language is extinct)
Placido
Trinidad and Tobago (Modern Caribbean nation, unlikely)
Eric Williams
Tripura (
Twipra Kingdom, Northeastern state of India, seems unlikely)
Birendra Kishore Manikya
Tupi (on my wishlist, they and related groups left some cultural/linguistic influence on modern Brazil)
Arariboia
Cunhambebe
Ukraine (should Kievan Rus be folded into Ukraine or be its own Civ?)
Bohdan Khmelnytsky
Ivan Mazepa
Ivan Skoropadsky
United Arab Emirates
(modern Gulf Arab state, unlikely)
Sheikh Zayed
Urartu (link, ancient Anatolian kingdom, Urartian language is decently attested)
Argishti
Uruguay (less likely to be the Spanish post-Colonial Civ than Argentina)
Jose Gervasio Artigas
Ute (
link, Amerindians of the Great Basin, were folded into Civ5's Shoshone)
Chipeta
Ouray
Uyghurs (
Uyghur Khaganate, unlikely, due to geopolitical reasons)
Bayanchur Khan
Uzbeks (Central Asian people, has as much chance as a Kazakh Civ)
Abdullah Khan II
Muhammad Shaybani
Vandals (
Vandal Kingdom, unlikely, because the Vandalic language is poorly attested)
Genseric
Vanuatu (Melanesian country, unlikely, was not unified until the colonial period)
Roy Mata
Venezuela (less likely than Argentina)
Francisco de Miranda
Romulo Betancourt
Vietnam (on my wishlist, my pick for leader is Le Loi)
An Duong Vuong
Gia Long
Ho Chi Minh
Lady Trieu
Le Duan
Le Loi
Le Thanh Tong
Ly Nam De
Ly Nhan Tong
Ly Thai Tong
Mac Thai To
Minh Mang
Ngo Quyen
Nguyen Hue
Tran Anh Tong
Tran Hung Dao
Tran Thanh Tong
Trieu Da
Trieu Mat
Trinh Kiem
Trung Sisters
Vijayanagara (
link, Southern Indian empire, folded into India?)
Deva Raya II
Krishnadevaraya
Wabanaki (
Confederacy, Northeastern Amerindians, consist of the Mi'kmaq, Maliseet, Passamaquoddy, Abenaki, Penobscot)
Henri Membertou
Wadai (
Empire, in Central Africa, unlikely)
Abd al-Karim Sabun
Wales (currently
Cardiff CS) folded into Celts in Civ5)
Cadwallon ap Cadfan
Hywel Dda
Llywelyn
Maelgwn Gwynedd
Owain Gwynedd
Rhys ap Gruffydd
Walla Walla (
link, Amerindians of the Plateau region, unlikely)
Yellow Bird
Wampanoag (
link, an important Amerindian people in the early history of Colonial North America (specifically New England), somewhat unlikely)
Awashonks
Massasoit
Metacomet
Wassoulou Empire (
link, West African empire in late 1800s, Samori Ture is currently a Great General)
Samori Ture
Wiradjuri (
link, Australian Aboriginal people, unlikely, see Eora above)
Windradyne
Xhosa (
link, alternative to Zulu?)
Hintsa kaKhawuta
Xiongnu (
link, Central Asian peoples, unlikely, since the Xiongnu language(s) is unknown)
Modu Chanyu
Yakama (
link, Amerindians of the Plateau region, unlikely)
Kamiakin
Yakuts (
link, Turkic people of Siberia, unlikely)
Tygyn Darkhan
Yalcon (highly obscure extinct Amerindian people of present-day Colombia, maybe the living Paez nation can be folded into them?)
Gaitana
Yamhad (ancient Semitic
Kingdom in present-day Syria, unlikely)
Yarim-Lim I
Yaqui (
link, Amerindian people of northern Mexico, unlikely)
Cajeme
Yeke (
Kingdom, in Central Africa, short-lived and unlikely)
Msiri
Yemen (on my wishlist, Arwa al-Sulayhi is my pick for leader)
Arwa al-Sulayhi
Asma bint Shihab
Dhu Nuwas
Yokuts (
link, Central California Amerindian people, unlikely)
Estanislao
Yolngu (
link, Australian Aboriginal people of northern Australia, see Eora above)
Wonggu
Yoruba (
Oyo Empire,
Yoruba, a major ethnic group in Nigeria, there's not much info on their historical leaders though)
Abiodun
Jakuta
Moremi Ajasoro
Oduduwa
Oranyan
Orompoto
Yugoslavia (seems unlikely, I wager Serbia is more likely to become a Civ)
Tito
Yumans (a
blob-Amerindian Civ of the American Southwest)
Irataba
Zapotecs (
link, currently
Mitla CS) Mesoamerican people, unlikely because of lack of info on their greatest rulers)
Cosijoeza
Zaachila I link
Zaachila III
Zhuang (
link, ethnic group of Southern China)
Nong Zhigao
Zimbabwe/Shona (on my wishlist, though the lack of info on their leaders is a problem)
Nehanda Nyakasikana
Matope Nyanhehwe Nebedza
Nyatsimba Mutota
