Jefferson/Mad Hatter
[Spoilers up to 2X03]
All the Jefferson!feels this episode! Sebastian Stan is really doing a great job in this role. Jefferson is easily one of my favorite characters. I know the character isn't a regular, but I'm really hoping eventually we get more of that back story. In the meantime I hope some good fic comes out of it. I've read a few stories, but none of them have really captured the character for me.
I have some other things to say about the show, a few things I don't like, but more things I adore, but I just watched 2X03 and that reunion scene was heart wrenching, if a little short.