I don't know if you have figured it out yet but you start game, choose mode, choose number of players, then you'll be able to character choose as well as perks
it was coded to be like a 2d cod originally, so every character that I'm adding will be a playable character, unless someone prefers their oc to be a zombie
I'm thinking zombie, if I were to do a boss, 1, nobody will get to see him unless they are a god at zombies, and 2, I'm thinking bigger and grosser for bosses, like a venom or hulk type size