I'm not sure which ones will end up in it :? Though since we're using paralle universes it shouldn't be that hard to add to it if we really need to
I think it would be best if characters like the ones you mentioned be NPC and be used sparrinly, simply because of power level, plus its more fun to create our own characters anyway plus they'll make the story more exciting if they suddenly turn up unexpectedly then vanish again for a while
I think it would be best if characters like the ones you mentioned be NPC and be used sparrinly, simply because of power level, plus its more fun to create our own characters anyway plus they'll make the story more exciting if they suddenly turn up unexpectedly then vanish again for a while