Regarding centaurs, if they are in the game, keeping it optional for those who would prefer to skip over that type of content would be a solid option. If it's in line with the lore/story, then not allowing it would potentially break immersion in the story. It is a fantasy world, and I'm sure it would be accepted, given what I've seen around here. I'm trying to say here that if the story warrants it for a graphic novel, don't be shy. But if it is controversial, then provide the option to skip it, much like what was done with the giant lady.