I suppose I may take [s]Captain America[/s] then as a Marvel character. We do have Iron Man, Thor, and possibly the Hulk, so all we need are Black Widow and Hawkeye, and we already have the OG Avengers.

DC character wise... I'm still deciding. Was considering exploring Batwoman and Power Girl but they'll be too similar to Batman and Superman so no. 

(Could we do villains?)