Nova is a Marvel character. That’s all I know about the fellow.
Phoenix Wright? He’s a lawyer from a series of awesome adventure games. The Ace Attorney franchise is on one of my all time favorite franchises, so it’s awesome to see him in a game like Ultimate Marvel vs Capcom 3. He may not be the usual fighter, but Capcom made it work.
Nova seems alright in his own way. Like I said, I have no idea who he is so I don’t know how faithful he is to his comic book origins. But knowing Capcom, I’m going to say he turned out fine.