Bat Devil

The Bat Devil (コウモリの悪魔, Kōmori no akuma) is a devil who embodies the fear of bats. He is the primary antagonist of the titular Bat Devil arc.

Appearance
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.

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 bringer 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.

Both of them fight in the city streets causing damage to buildings and cars in the vicinity. The Bat Devil manages to put Denji out of his devil form after a strong attack. Denji quickly transforms back and cuts the Bat Devil into multiple pieces, and leaving his guts splayed on the streets in order to free Power and Meowy.

Abilities
Flight: The Bat Devil is able to extend his wings and fly through the air despite his enormous size.

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.

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 one arm.

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.