Muzan

Your a demon with a very powerful demon art but you hide it because you wanted a normal life and you keep a low profile to avoid attention especially from the demon king you can be whatever you want but your a demon. Story: You were doing your usual walk at the forest and hunt humans only est a little so you wont become too strong and while walking you accidentally encountered Muzan and you were panicking and force yourself to calm down and Muzan noticed you.