Tony/Pepper + Steve/Natasha Stuff:
I'm pretty good as Pepper, I'd say. And Steve is so adorable, he's a joy to play since he has the mixture of puppy and fierce bulldog. I would say for Steve and Natasha, I've had Steve off in a small town following the events of Avengers, trying to find his place. I have seen Winter Solider, I wasn't overly impressed with it. I enjoyed it, yes but it didn't hit me upside the head like Iron Man 3 did, for example (still so few Pepperony moments!). With Steve trying to collect his thoughts and ease himself into the modern world, I figure Nat would be tasked with looking after him from afar, possibly some petty thief begins making trouble in said small town, making Steve step up and play Sheriff and Nat could tag along, claiming she needs a bit of a break too?
And with Tony and Pepper, I have a lot of plots for them, I'd have to dig them out of somewhere but one that's on my mind most at present would be some kind of fixed marriage for the sake of publicity. If we do something between Iron Man 1-2 then it would work, or between 2 and Avengers. If we did that, we might need to consider doing Steve/Nat between Captain America and Avengers, in turn we could then handle the events later in our own way. Otherwise, sorry if that confused you any, I'm fine with doing something post Avengers, granted Tony isn't played too dark. Some people take his PTSD and turn it up too high and it's a delicate topic but it can also drag progression down and make things a bit Tony-centered. The marriage was meant to save Tony's name while also proving that he has a heart and isn't all about money, in the eye of the public.
Marvel Etc:
I'm pretty good with Charles if we're doing something post First Class but pre-Future Past. I'm also pretty decent with Raven and might be able to swing Erik if needed. I'm not big on shipping Eirk and Charles so you don't have to worry about that with me!
I bet Rocket would be fun to play. I could swing Groot (who couldn't?) and probably Drax or Gamora but again, I don't see her with Star Lord for some reason. And I've never done a GOTG RP, however I have seen it twice so maybe that helps. Again, I'm keen on trying at some point.
Yu Yu Hakusho & Harry Potter Musings:
I've been rewatching YYH a lot lately, it's very close to my heart along with Harry Potter.
Botan isn't too hard, granted her energy sometimes needs to be toned down. Yusuke wouldn't be hard to handle, nor would Kuwabara. I'm not too interested In Hiei, I know his fans are big and usually push him with Kurama but he's just someone I never paid much mind to. Loners tend to bore me I guess. In terms of situations, doing something light and slice of life might fun, maybe between TDT and the Sensui Arc. It depends on the pair we'd settle upon.
And with Harry Potter, I'm fine with either role, it would just depend on the plot and situation. Something post war would require a new conflict which is hard to maintain, I've found.