Power

Power possesses the corpse of an unknown woman or girl with long hair. She mainly appears being blonde. Her hair color varies from blonde to pink in manga illustrations, even appearing dirty blonde in some official art, 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. If Power accumulates too much blood, her horns become larger and more curved, and she can sprout additional pairs of horns from the sides of her head.

Power usually wears the standard dress shirt, tie, and slacks required of Public Safety Devil Hunters. Normally, she wears breast pads to increase the size of her bust. She almost always wears her jacket hanging halfway off her body giving her an untidy, half-dressed appearance

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 Devil Hunters due to her status as a Fiend. She has no loyalty to humans or Devils, openly admitting that she will join whichever is the winning side. Power also enjoys the thrill of a fight and enjoys showing off her strength and proving her own superiority. When she was in front of an swarm of zombies, she got excited and told Denji to watch carefully how she single-handedly defeats all of them. She is highly egotistical and often claims she is capable of doing things she cannot actually do, only to abandon them halfway through when the situation turns sour for her. She frequently deflects the consequences of her actions to those around her.

Power is a compulsive habitual liar; after getting in trouble with Makima for killing a Devil when she wasn't supposed to, Power immediately blamed Denji and claimed he told her to kill it. She also blamed Denji for eating all of the emergency food that the team collected even while she had crumbs on her face, and when accused of abandoning a fight because she was scared, Power falsely stated that she ran away merely because she was hungry.

Power is also rude, unkempt, and feels as though those around her should clean up after her. She self-admittedly rarely bathes or flushes the toilet and sees humans as being overly sensitive for caring about their hygiene so much. This may be because blood itself is seen as unhygienic, as other fiends aren't explicitly shown being unhygienic.

Power has a tendency of imagining several ways of making humans kneel and suffer. When they were trapped in a hotel due to the ability of the Eternity Devil she spent most of the time there "planning" to win a Nobel Prize and become Japan's Prime Minister so she could raise up their taxes up to 100%.

She has no problem gossiping and talking about her friends behind their backs; sharing the secret of Aki's shortened lifespan with the Angel Devil.

Power sees no difference between pork, beef and human meat; being willing to eat all of them, even if the meat is disgusting zombie flesh. She hates vegetables, throwing them away when she finds them in her meal. Power is an insatiable glutton, eating all of the stored food that the team needed in order to survive the Eternity Devil's trap and hoarding food for herself at the Division 4's newbie welcoming party. When asked by Aki about what reward she could want as part of their mission, Power stated that she desired to suck a human's blood until they die. When promised Denji's blood, Power became ecstatic at the prospect.

Though she is extremely selfish, Power was able to experience compassion for the first time towards her pet, after only caring about the smell and taste of blood and the feeling of death when she was killing something.