As long as they are from an actual story/game/anime (like the Fate series) that's totally fine!

A good litmus test is like "Abe Lincoln but he's Abe from Clone High/Abe Vampire Hunter!" That's totally okay. But "Alexander Hamilton from the Hamilton play" is just...himself, only abridged and singing, so that's a no go lmao.

Anyway this is a long way to say yes that's fine!