In a manga full of Devils representing primal fears, one character stands out for representing something unexpectedly wholesome: chaos, selfishness, and ridiculous confidence. Power the Blood Fiend isn’t just comic relief—she’s Chainsaw Man’s most human character, and that’s saying something considering she’s literally a Devil in a corpse.
What Is a Fiend?
Before understanding Power, we need to understand what she is. Fiends are Devils who’ve possessed dead human bodies. Unlike pure Devils, they retain some human characteristics—physical form, potential for human emotion—while maintaining their Devil personalities.
Power is the Blood Devil inhabiting a human corpse. She has small horns, fangs, and the ability to manipulate her own blood. More importantly, she has a human-adjacent mind capable of growth, attachment, and eventually… something like friendship.
First Impressions: Utterly Insufferable
Power enters the story as the worst possible partner for Denji. She’s arrogant, selfish, deceitful, and constantly boasting about accomplishments she didn’t earn. Her first major action is betraying Denji to a Devil in exchange for her pet cat.
This introduction is important because it establishes Power’s values: she cares only about herself and Meowy (the cat). Humans are tools. Devils are threats or prey. Nothing matters except what benefits Power directly.
The Meowy Incident
When Power trades Denji to the Bat Devil to save Meowy, it seems like pure villain behavior. But there’s something almost touching about it: Power genuinely loves her cat. It’s the first crack in her completely selfish facade—she has capacity for attachment, just extremely limited capacity.
Growth Through Proximity
Forced to work alongside Denji and Aki, Power slowly changes. Not dramatically, not through big moments of realization, but through accumulated time spent with people who don’t immediately try to kill or use her.
Learning What Friends Are
Power doesn’t understand friendship initially. She understands alliances, mutual benefit, and strategic positioning. But Denji’s lack of ulterior motives confuses her. Why would he help her if there’s nothing in it for him?
The answer—because they’re friends—takes most of the manga for Power to truly grasp. But by the time she does, she’s willing to die for it.
Personality Breakdown
Endless Self-Promotion
Power’s constant boasting about her superiority is both annoying and endearing. She claims to be the strongest, smartest, and most important Devil Hunter despite evidence to the contrary. This isn’t delusion—it’s defense mechanism. If she’s the best, she can’t be hurt.
Cowardice and Bravery
Power is frequently shown as cowardly, running from battles and hiding behind others. But when people she cares about are threatened, she fights despite her fear. This makes her eventual sacrifice more meaningful—she wasn’t a naturally brave person who died heroically. She was a coward who overcame her nature for someone else.
The Vegetable Issue
Power refuses to eat vegetables, lies about her achievements, doesn’t understand hygiene, and generally acts like a chaotic toddler with supernatural powers. These quirks humanize her more than any serious character development could.
Combat Abilities
As the Blood Devil, Power can manipulate blood—mostly her own, but also consumed blood when she needs extra material.
Blood Weapons
Power typically creates hammers and spears from her blood. She prefers brute force approaches, smashing rather than finessing. Her weapons are strong but require her own blood, making extended combat drain her rapidly.
Power’s True Power
When fully restored by Makima, Power’s Blood Devil form is genuinely dangerous. Her true body sprays blood as weapons from every direction. But this form also represents loss of self—the more powerful she becomes, the less “Power” she is.
The Aki-Denji-Power Dynamic
Chainsaw Man’s emotional core is the found family of Aki, Denji, and Power. They start as reluctant coworkers and become something like siblings.
Annoying Each Other
Power and Denji have childish rivalry—fighting over food, competing for Aki’s attention, making each other’s lives difficult. But their annoying relationship is genuine connection. They bicker because they’re comfortable enough to be themselves.
Aki as Reluctant Dad
Aki’s role as the responsible one trying to manage two chaos agents is comedy gold. Power specifically enjoys pushing his buttons, stealing his food, and creating messes for him to clean. But she also clearly respects him, even if she’d never admit it.
The Darkness Devil Arc
Power’s confrontation with the Darkness Devil is pivotal. Facing a Primal Fear Devil, Power is genuinely terrified—and who wouldn’t be? This Devil predates humanity itself.
Trauma and Growth
The trauma from this encounter affects Power deeply. She becomes clingy with Denji, afraid of the dark, unable to function independently. Watching the loud, confident Power reduced to a trembling child who needs to sleep in the same room as others is heartbreaking.
But it also shows her trust. Power lets herself be vulnerable around Denji because she believes he’ll protect her. That belief, for someone who trusted no one, is enormous growth.
The Sacrifice
Power’s death protecting Denji from Makima is the emotional climax of Part 1. She dies not as the Blood Devil but as Power—the friend who finally understood what friendship meant.
The Blood Contract
Power’s final act is giving Denji her blood, allowing him to transform and briefly overwhelm Makima. Even in death, she’s helping him. The selfish Devil who cared only about herself chose to die for someone else.
The Promise
Power’s request—that Denji find the Blood Devil reborn and help her become Power again—is both sad and hopeful. She knows she’ll return as a Devil without memories, and she trusts Denji to find her and rebuild their friendship from scratch.
Why Power Resonates
Power works because she’s a character who grows without losing what made her interesting. She starts terrible and becomes someone capable of sacrifice while remaining chaotic, boastful, and ridiculous.
Earned Change
Her growth feels natural because it’s slow and incomplete. Power at the end still lies, still boasts, still causes problems. But now she does it while caring about people instead of viewing them as tools.
Comic Relief That Matters
Fujimoto walks a difficult line—making Power funny without making her disposable. Her comedic moments are genuine comedy, but her serious moments hit hard because we’ve grown to care about this ridiculous character.
Conclusion
Power the Blood Fiend represents Chainsaw Man’s core theme: connection transforms people. She began as a Devil who cared about nothing but survival and a cat. She ended as someone willing to die for friendship.
Her journey from chaos goblin to tragic hero never loses sight of what makes her entertaining. She remains Power—selfish, loud, confident beyond reason—while also becoming someone capable of love.
That balance is why Power isn’t just comic relief or tragedy fuel. She’s a complete character who earned her emotional moments by being absurdly, wonderfully herself throughout the story.