Hi ya. I think this should answer your question. For context this is a response I receive from admin
"Regarding crediting fandoms, all we need is a notice that says "This is a Pokemon fan-character" on the character's profile (this seems dumb for Pokemon, but the reason this is important is sometimes the source content is obscure or not readily apparent at first sight). Placing the character in a folder or tag specifically for the fandom would also work (eg. tagging them as "pokemon"). "
While the context is Pokemon, this can be applied to other fandom characters. So yeah. It's nothing too complicated.