Mobas in general tend to have a lot of characters. Games I can think of off the top of my head: Don't starve (10ish or so characters I think) Dungeon defenders (also sitting around 10 if you have all the dlc) Tf2 (9 classes) Monaco: What's yours is mine (I want to say it has something like 7 characters) Walking Dead: 400 days (5 Characters IIRC)
I kinda liked RE6 but after finishing the campaigns... :/
Anyways, thanks for all the games you named guys! I'll check them out soon. Though I prefere games that are RPG-ish like you gain a level, distribute stats and/or skills or just upgrading each and every characters.