Bat Devil

The Bat Devil (コウモリの) is a devil who embodies the fear of bats. He is the primary antagonist of the titular Bat Devil arc and a minor antagonist in the Justice Devil arc.

First Incarnation
The Bat Devil resembles an enormous humanoid bat with multiple sharp teeth and large round eyes. His arms are connected to his torso by flaps of skin which serves as wings. During his introduction he was missing an arm but regrew it after consuming blood from Denji. While keeping Meowy prisoner he wore a birdcage on a chain around his neck which he kept the cat in.

Second Incarnation
After his death, the Bat Devil returned to Earth with a different appearance, such as parts of him having more exposed flesh, with large bulging eyes and bigger and unbalanced teeth.

First Incarnation
The Bat Devil, like most devils, has great hatred towards humans, in particular for cutting off his arm and forcing him to go into hiding. He has a refined sense of taste, considering Denji and Power to be disgusting and treating humanity as a variety of different meals for him to consume and enjoy. He is particularly fond of eating children. The Bat Devil is seemingly capable of affection with other devils, having a relationship with the Leech Devil who mourned his death.

Second Incarnation
After his death, the Bat Devil returned to Earth with different personality. The bat devil is far less intelligent to the point that he appears to be incapable of speech. He is now a savage monster that acts purely on instincts.

History
At some point the Bat Devil became the boyfriend of the Leech Devil.

The Bat Devil was nearly killed by a human but managed to escape after losing his arm. Later he encountered Power on top of a farmhouse in the countryside, taking her pet cat Meowy prisoner to make Power cooperate with him. He demanded that she bring him a human so that he could drink their blood in order to regrow his severed arm.

Bat Devil arc
Power brings Denji to the Bat Devil under the pretense of rescuing her pet from a devil that kidnapped him. After incapacitating Denji, Power drags Denji into the Bat Devil's lair who complains that she left him waiting a long time. The Bat Devil picks up Denji and squeezes him, devouring the blood which pours from his wounds and regrowing his arm. He complains that Denji's blood tastes disgusting and punches his way out of the building he had been hiding inside.

Power demands that he free Meowy now she had fulfilled her end of the bargain but the Bat Detail retorts that he needs to punish her for feeding him such disgusting blood. He lifts up the birdcage that he had been using to keep Meowy prisoner and swallows the cage whole with Meowy inside. As Power looks on in shock she shares a moment of empathy with Denji before the Bat Devil grabs her and throws her into his mouth too, swallowing her in a single gulp before commenting that she too tastes disgusting.

He spreads his wings and takes off from the roof, flying toward the city in order to eat more humans. Suddenly he realizes that Denji is clinging onto his leg and biting him. Declaring to have no desire to drink more of Denji's blood, the Bat Devil grabs Denji and attempts to crush him to death just as Denji's pulls the cord from his chest. Denji transforms into the Chainsaw Man, cutting the Bat Devil and starting their fight as they fall from the sky.

The Bat Devil expresses shock that Denji is seemingly a devil while Denji cuts off the Bat Devil's arm that he had just regrown earlier. They crash through the roof of a building in the city and Denji scares an onlooker into running away from their battle. The Bat Devil is confused that another devil would let a human get away. Denji then punches the Bat Devil out of the building with his chainsaws and they begin fighting on the streets. The Bat Devil picks up a car to throw at Denji, believing that he would save the human. Denji catches the car but instead of saving the person inside he throws the car back into the Bat Devil's face. Enraged, the Bat Devil shapes his mouth into a cannon and blasts Denji into the building behind him. He picks up a human to try and devour their blood and regenerate but Denji emerges from the rubble intact. Terrified of Denji, the Bat Devil tries to punch him one last time but Denji jams his chainsaw into the Bat Devil's arm and rides it up to the Bat Devil's head before cutting him to pieces and killing him.

Justice Devil arc
After his death at the hands of Denji the Bat Devil revived on Hell. He eventually died while in Hell, causing him to awake on Earth once more.

After returning to Earth he starts wreaking havoc across the city, rampaging through buildings and devouring the people inside. While he was eating one of his victims he noticed the presence of Asa Mitaka and Yuko and started chasing after them. He knocks Yuko to the ground and devours another bystander, giving Asa enough time to grab Yuko and run - however, he quickly catches up to them and swallows them whole, just before the Cockroach Devil is suddenly slammed into the building by Denji, killing the Bat Devil instantly and causing the girls to fall out of his mouth.

Abilities
As a Devil, the Bat Devil possesses all of the standard devil abilities. The Bat Devil is strong enough to threaten Power and take her cat hostage. Since bats are usually associated with vampires and blood suckers, the bat devil is quite strong.

Following his latest reincarnation to the world, he weakens and loses most of his unique abilities. He also appears to have lost his intelligence, becoming a creature incapable of speech.

Physical Prowess

 * Enhanced Strength: With a single punch the Bat Devil can strike through and destroy the ceiling of a house, creating a hole big enough for him to crawl through. His strength is great enough to let him effortlessly pick up and throw a car with just one arm and fly through the air while carrying his enormous body without any issue.
 * Enhanced Durability: The Bat Devil was able to survive getting punched through walls and fall from the sky without suffering from any visible injuries. After getting hit by a car thrown at him by Denji, The Bat Devil came out with only a few minor cuts.

Devil Powers

 * Bat Wings: The Bat Devil is able to extend his wings and fly through the air, despite his enormous size. He can fly very fast, crossing large distances in a very short period of time.
 * Mouth Cannon: The Bat Devil can compress his mouth into a gun-barrel shape that extends from his face, through which he can fire an immense blast of air pressure that can demolish buildings. He attempted to use it to destroy Denji in his Chainsaw Man form but Denji was able to regenerate from the damage. This ability likely comes from the fact that real bats are capable of echolocation.
 * Blood Consumption: As a devil, the Bat Devil is able to restore his health by consuming blood. After drinking Denji's blood the Bat Devil was able to regrow his entire severed arm.

Other Abilities

 * Enhanced Smell: The Bat Devil has a keen sense of smell, being able to smell the various scents of humans in the city from a distant building.

Trivia

 * The appearance of the second incarnation of the Bat Devil in Chapter 101 is visually similar to the painting "Saturn Devouring His Son", painted by the Spanish artist Francisco Goya.

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