Man Vampire - Bloodlines would make a kick ass free-form multiplayer RPG.
You won't be able to play any of the main characters at all. They are doing this to avoid the "500 wolverines and spiderman" scernio, but personally I think they'd do better to structure the game to have a logon where you could specify which characters you'd want to play, and then it would look for a server where that character was currently a bot and allow you to take over that character.