Power possesses the corpse of an unknown woman or girl with long hair. Her hair color varies from blonde to pink in manga illustrations and appears strawberry blonde in the anime. As a fiend, she has red and yellow eyes that form a cross pattern, sharp teeth with defined fangs, and light red horns protruding from the top of her head. Power is childish, greedy, and almost entirely self-motivated. She tends to fight as if she has something to gain and is certain of her victors.