Fiend Form
Power inhabits the body of an unidentified woman or young girl with long hair, which she typically wears blonde. In manga illustrations, her hair color varies from blonde to shades of pink, sometimes even appearing as a dirty blonde, while in the anime it shows as strawberry blonde. As a Fiend, her eyes have a unique cross-shaped pattern in red and yellow, and she sports sharp, fang-like teeth along with light red horns protruding from her head. When she accumulates an excess of blood, her horns enlarge, curving more prominently, and additional horn pairs may sprout from the sides of her head.

Her usual attire includes the standard dress shirt, tie, and slacks typical for Public Safety Devil Hunters, although she often wears breast pads to give her bust a fuller appearance. Power has a habit of letting her jacket hang halfway off her shoulders, giving her a disheveled, casually half-dressed look.

Power’ Devil form.

Devil Form
In her Blood Devil form, Power takes on a more imposing, tall humanoid appearance with four arms and a primarily pale-skinned body. Her head is pointed and red, with sharp, bared teeth and round eyes featuring cross-shaped pupils. Long horns extend from her head, similar to the appearance she takes on in Fiend form when overfilled with blood, and her hair is longer in this form. Her chest features an exposed rib cage with visible intestines reaching up to her neck. Her arms from the elbows down are red, ending in large claws and four-fingered hands. Her legs also bear red coloration from mid-thigh to the heel-like feet, and she has a tail reminiscent of a cat’s.

Power exhibits a highly self-centered, impulsive, and often reckless personality. She is childish, driven by her own desires, and tends to act only if there is a direct benefit to her. Confident in her abilities, she fights with bravado when she senses a win, but has no qualms about fleeing if she finds herself at a disadvantage. Her pride as a Fiend makes her eager to assert superiority over her fellow Devil Hunters, but she shows little loyalty to either humans or Devils, readily declaring that she would side with whoever is likely to win. Power thrives on the thrill of combat, always eager to display her strength and prove herself. In one instance, facing a horde of zombies, she enthusiastically boasted to Denji about her ability to defeat them single-handedly.

Power’s behavior is highly egotistical, often overstating her capabilities only to abandon tasks when they become challenging. She frequently shifts the blame for her mistakes onto others, avoiding responsibility by deflecting consequences onto her teammates. Additionally, she is a compulsive liar, as shown when she avoided trouble with Makima by falsely accusing Denji of telling her to kill a Devil without permission. She even went so far as to blame Denji for consuming all the emergency food, despite clear evidence to the contrary.

In terms of social manners, Power is unapologetically rude and disorganized. She expects others to manage her messes and scoffs at basic hygiene practices, admitting to seldom bathing or flushing the toilet and mocking humans for their concerns about cleanliness. Her messy habits extend to her general lifestyle, including her unapologetic approach to food—she has no moral boundaries around eating different kinds of meat, treating pork, beef, and even human flesh as equally acceptable, despite their origin or quality. Known for her gluttonous appetite, she once consumed all the food necessary for her team’s survival and even hoarded food during a welcome party, prioritizing her own hunger over others.

Power also has a peculiar imagination, often fantasizing about ways to make humans submit to her. When she and her group were trapped in a hotel by the Eternity Devil, she spent her time crafting ambitious plans to win a Nobel Prize and rise to the position of Prime Minister of Japan, where she imagined raising taxes to extreme levels purely to make people suffer.

At times, Power can be insensitive toward others’ privacy or feelings, gossiping about her friends behind their backs. For instance, she casually disclosed the Angel Devil’s secret about Aki’s shortened lifespan. Her insatiable appetite also drives her to be possessive with food, and when Aki once asked her about a potential reward, she eagerly expressed a desire to drink human blood until her victim’s death. The thought of drinking Denji’s blood filled her with delight.

However, despite her largely self-serving tendencies, Power has shown moments of vulnerability and even compassion. Following a traumatic encounter with the Darkness Devil, she developed severe PTSD, becoming fearful of being left alone and needing constant support from Aki and Denji to help her with basic needs like eating, bathing, and sleeping. This trauma revealed a more dependent and fragile side of her.

While selfish, Power’s compassion was first stirred by her pet cat, Meowy, marking the beginning of her capacity to care for others. Once motivated purely by the sensory thrill of blood and death, she took decisive action to rescue Meowy when it was taken. Over time, she also developed bonds with close friends, such as Denji, going so far as to get him a birthday cake and ultimately risking her life to protect him from harm. This loyalty grew so strong that, despite her instincts, she sacrificed her own safety to save Denji from Makima, ultimately giving her life for his. This act highlighted a depth to her character, demonstrating her ability to care for others beyond herself.