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Just wondering what about Left 4 Dead you haven’t put characters from that game in here maybe the main characters could be like super bending masters that Chell and Scout meet to learn special bending that regular benders couldn’t teach them and the infected well I’m not very sure for them but maybe the special infected could be a dangerous but easily controllable group of spirits that Grey Mann sends after them just a thought you could also try something with the popular Half Life Mod Cry of Fear you could make something interesting from it especially from the monsters and the protagonist Simon