Your concept sounds very interesting. If you ask the question "Does this game have a hero?" and if the answer is "Yes" in any moment of the game, then most likely the limitation is being broken. So my recommendation is just to call your characters villains, just has different types of villains or agendas.
Also, if you want answers faster, feel free to join and ask any of the staff on discord server: https://discord.gg/mfUvxsS