Power has the appearance of a young woman with mid-back length hair. Her hair color varies from blonde to pink in manga illustrations, and appears blonde with a pinkish tint 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 victory, and has no problems with running away from a fight where she is outmatched. She feels the need to boast her superiority over her fellow Hunters due to her status as a fiend. She has no loyalty to anyone, openly admitting that she will join whichever is the winning side.
 
Power also enjoys the thrill of a fight to show off her strength and prove to be superior to anyone. When she was in front of an army she got excited and told Denji to watch carefully how she single handly defeats all of them.