You could always change base colours or costumes.Thanks a lot guys for your answers, I've been digging a bit, actually I'm curious about the "something unlimited" case, they are one of the biggest adult superhero games and currently the project is still on patreon, and still using DC characters in a literal way (I mean with its drawing style and exact names). In fact that project with an Avatar, GOT and other similar adult games, were the ones that gave me the security and tranquility of making this game with the crossover of characters, using the same names and appearances.
Could someone explain to me what happened to something unlimited? Because as I say I see that it remains the same, so I do not know if they really had a problem or nothing really happened.
And in that case, what option would there be to reduce the risk? Could changing the names of the characters a little work? Or is it a solution that is not effective in these cases? My goal would be to be able to use games from different franchises, Marvel, Naruto, MHA, Dragon Ball, DC, Avatar, Bleach, One Punch man, etc. But, I really would like to better understand the copyright situation and the options before deciding to eliminate a franchise that may be interesting for a lot of users.
As a sidenote it needs a tonne of buttstuff. Some kind of perversion quirk/equipment to genderswap/futanise characters would be kinda cool and make things technically OCs too