The One Fluff to Rule them All
Serana from Skyrim. She's the only follower from that game that I've actually gained an emotional connection to and it makes me sad that after you go through so much together you can't get married or have her stay at your house. Other followers you can just walk up to and they will be like "sure lets get married" when you don't do anything. Also you can't marry any Khajiit in the game which makes me sad because J'zargo is pretty cool too.