Bat Devil

The Bat Devil is a devil who embodies the fear of bats. He is the primary antagonist of the titular Bat Devil Arc. He encountered Power on top of a farmhouse in the countryside, taking her cat Meowy prisoner to make Power cooperate with him.

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He demands that Power bring him humans so that he can drink their blood in order to regrow his severed arm after nearly being killed by a human.

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At some point the Bat Demon became the boyfriend of the Leech Devil. After his death by the hands of Denji, the Leech Devil sought revenge against Denji and Power.

(Source: Chainsaw Man Wiki)