Switzerland :
Leader : Guillaume-Henri Dufour
UA : Confederation
Each diplomat in Switzerland capital city gives +15%

in all cities of its owner and +5%

in all swiss cities. Mountain tiles give +1

+1

and +2

.
UB : Kreditanstalt
Replaces Bank. +25%

gold, +1

gold for each 2

in the city, +2

when discovering Electricity.
UU : Confederate pikeman
Replaces Pikeman. +15%

when attacking units from an hill tile to a non-hill tile. +100

when gifted and +15

if gifted to a city-state.
Dufour was the General (highest grade possible in war-time) of the swiss army during the Sonderbund civil war which opposed the conservative-catholic cantons (regions) and the liberal ones. He managed to make this civil war last only three weeks and have few casualities. He's considered as a national hero and most swiss towns have a road with his name.
Switzerland is a peace oriented civilization. I wanted a UA that prevented other civs to DoW Switzerland. A first draft was to give a hapiness disadvantage for DoW Switzerland. But I liked more the idea that having an alive switzerland was useful for civilizations. Hence the gold bonus. A 15% bonus might be considered high in comparaison to the 5% for Switzerland. But you have to remember that the bonus from multiples diplomats stacks, making possible to have +35% gold on a standart game (with 8 civs). In addition, a civ will always want to have a bonus in gold and will wonder that a +5% gold to Switzerland is small compared to what they get. The bonus for mountain tiles derives from the geographical situation of Switzerland (60% of its territory is mountain) and is a bit of a boost at the start of the game until the renaissance era (where the spies and diplomats appear).
The Kreditanstalt is of course linked with the bank and financial tradition of Switzerland. The GPT per capita represents the high revenue of most of the Swiss and the tax revenues that derive from it. The tourism revenue indicates the high position of the swiss financial place in the world and the interest of the people about it.
Finnaly the Confederate pikeman is a medieval unit inspired from the first Swiss soldiers who defended their rights against the imperial army led by the Habsburgs who wanted to take back their domain (Habsburg is a castle in the middle of Switzerland). During this periods of resistance (roughly between 1291 and 1499), the swiss peasants fighted against the noble cavalry and were known for their courage and their strength. For example, the pope Julius II asked for 200 swiss soldiers as his personnal. Which is now the Swiss Guard. The hill bonus derives from the Morgarten battle where the Swiss trapped the cavalry between the hills and the lake and throw at them lumbers and stones before fighting them. The gold and influence bonus is a reference to the swiss mercenary who fought for other nations (and sometimes having swiss fighting on both sides during a battle).
Speaking of strategy, Switzerland is oriented towards gold generation and diplomacy. Wanting his diplomat in Swiss capital city prevents from DoW, denouncing and even having this city conquered by another civilization. The confederate pikeman can be used either as a mean of defense or a mean of having more influence on CS. Since confederate pikemen are obsolete with metalurgy (with the lancer), Switzerland can stress on the upper side of the tech tree and take profit of the arsenal of democracy to boost influence on CS. With all of those elements, Switzerland is good for a Diplomatic Victory, a Science Victory (using buying SS parts with gold) or even Cultural Victory (having a bit of a boost with the Kreditanstalt).