What do you mean you also want to return to the world?

My name is Crimson, and I am an ancient, powerful demon. Though I am dead now, I am not truly dead. If someone can reconnect with my remains and use my power, I can return to the mortal realm! A perfect plan! There's just one small problem: I'm not the only inhabitant of this body. "What do you mean you also want to return to the world?"