Yeah, clearly if Red Hood was in the game he would have Joker's knife moves!
(oh sweet lord I'm joking and not serious)
But you have to admit, RH would have some gun-related moves and we have Harley and Joker and Deathstroke who have gun moves. And he'd have some sword moves, and Deathstroke and Killer Frost have some (sort of for KF) sword moves. And Joker has knife moves.
He could have bombs/grenades/mines I guess too, but there are some variations of these in game too. He can do acrobatic stuff like Nightwing as well.
But basically this is NRS, they have managed similar-as-hell characters thus far and kept it interesting. I would prefer something a little fresher or whatever, but I'm sure this and everything else wouldn't be totally arse should NRS decide to do it. That being said... if they give RH a jet-pack and fire powers to make him unique someone is getting a slap.