1) The Flash
-- Adventure racing, bullet time to the nth degree will put all those timewarp characters to bed. A GREAT rogues gallery for cool innovative boss battles and "tracks" that run from central, to keystone, to gotham, to metropolis, to london, moscow, tokyo, coast city and back again would make this THE best game you've ever thought of... this game needs to be made..
2) Green Lantern
--what kind of lantern will YOU be...
3) Ultimates or Authority
--None of this pigeonholed Action RPG stuff, I want to see full throttle world shaking over the top city smashing action in surround sound... A world with Hulk Ultimate Destruction's destructible environments, Shadow of the colossus scope and 5-10 great, unique playable characters. This game needs to be made. Remind us why we NEED superheroes.
4) An MMO or Network Action game where you can team up as established marvel or DC heroes on multiplayer co-op campaigns. The closest things to this out right now are mods for Freedom Force. Or maybe bootleg chars for City of Heroes. But this game needs to be made. Big time.
5) A Free Roam Action-Detective Batman game
They've come so close, and Bamtan's been so overdone, but it really is time, guys...
6) Wonder Woman
This is one character that's been underplayed for years. Where Kratos now stands, Wonder Woman should be...
7) Danger Girl
Rumble Roses would be put to BED
8) Sojourn/Sigil/Meridian (CROSSGEN)
These characters and worlds are RIPPINGLY RIPE for RPG material. Dear goodness... even now, with the series' over for much time, the universe is so deep and compelling, it can be brought back at ANYtime...
9) Sonic the Hedgehog
They keep trying to reinvent him... give him the storyline, world, and supporting cast from the early days of his Comic books and People will eat sonic up. You wont need to reinvent his gameplay, people will flock to see what he's doing the same old style, because he'll be cool again.
10) Gen 13
It's just too much fun to miss out on. Either team.