LightSpectra
me autem minui
I'm aware the majority of these are available as mods, but these are ones I'd like to see as part of the "core" game, or perhaps in Civilization V.
Civilizations
Poland (Casimir III), Isreal (David), Assyria (Ashurbanipal, or perhaps Tiglath-Pileser III), Venezuela (Simon Bolívar), Brazil (Pedro II), Timurids (Timur), Sweden (Gustavus Adolphus).
Leaders
I would say China and Rome are the two civilizations that deserve four leaders.
Trajan & Romulus (Rome), Nebuchadnezzar II (Babylon), Muhammed Ali (Egypt), Constantine I (Byzantium), Yik'in Chan K'awiil (Maya), Taizong & Kangxi (China), Maurice of Nassau (Netherlands), Antonio Salazar (Portugal), Ayatollah Khomeini (Persia), Menelik II (Ethiopia), Akbar (India), Abu Bakr & Harun al-Rashid (Arabia), Sargon (Sumer), Charles I (Spain), Meiji, or perhaps Ito Hirobumi (Japan). I'd also change "Holy Roman Empire" to the Franks, and add Charles Martel.
Civilizations
Poland (Casimir III), Isreal (David), Assyria (Ashurbanipal, or perhaps Tiglath-Pileser III), Venezuela (Simon Bolívar), Brazil (Pedro II), Timurids (Timur), Sweden (Gustavus Adolphus).
Leaders
I would say China and Rome are the two civilizations that deserve four leaders.
Trajan & Romulus (Rome), Nebuchadnezzar II (Babylon), Muhammed Ali (Egypt), Constantine I (Byzantium), Yik'in Chan K'awiil (Maya), Taizong & Kangxi (China), Maurice of Nassau (Netherlands), Antonio Salazar (Portugal), Ayatollah Khomeini (Persia), Menelik II (Ethiopia), Akbar (India), Abu Bakr & Harun al-Rashid (Arabia), Sargon (Sumer), Charles I (Spain), Meiji, or perhaps Ito Hirobumi (Japan). I'd also change "Holy Roman Empire" to the Franks, and add Charles Martel.