Is your username any hint of that? :D

Hmm, I'm going to have to think about Tony since I don't like Pepper (bleh) and I don't write MxM... Maybe more crimefighting bromance?

I could create an OC, like an up-and-coming hero. Otherwise, I'd totally play Spiderman. I really like him. 
I can also do Wolverine, but I'm just unsure if the chemistry is going to be there. 

Otherwise, I see you're quite eager about BuckyxNatasha. I could try do Natasha for you in that pairing. I don't know enough about Bucky to do him.