CAPTAIN AMERICA
A lot of what Steve will do depends on how things go in game, but one thing is for sure - he's a good friend. I would love to explore multiple friendships, even if they're rough going at first, so that people can see that he's genuinely just a good person. Obviously he'll go leader mode, not because he thinks he's best for it but because it's who he is, but he's also a shoulder to cry on.
Anything down that line would be good to possible have options for, seeing as he's social enough that they could easily organically come about in game.