The Legs Devil embodies the very concept of legs, a Devil eventually broken and enslaved by the Death Devil. Its brief but striking role unfolds when Denji swallows its effigy, stripping legs from creatures across the world and robbing Yoru of her lower body in the middle of battle.
The full form of the Legs Devil has never been shown.
Nothing about its character or temperament has been revealed.
At an unstated time, the Death Devil overpowered the Legs Devil and pressed it into her service as a pawn. Its moment arrives during the War Devil arc. After Yoru drives the Moon Spear through Denji and gives chase, she abruptly buckles atop a building and discovers that everything below her waist has vanished. The cause traces back to the Fourth East High School, where Denji has eaten the Legs Devil's effigy, one of several Devil pawns the Death Devil handed him while he pretended to ally with her. As he keeps consuming more pawns, Yoru rages, and around the globe creatures find themselves unable to move for want of legs. She works out that erasing a concept does not always reshape the world instantly.
Denji then swallows the Teeth Devil and wipes teeth from existence as well. Barely able to form words, Yoru spots a motorcycle as she falls and converts it into a Chainsaw Motorcycle, ramming it into him so hard that he vomits up a jumble of body parts and previously eaten Devils. She drags herself to him and forces her arm into his mouth, warning that turning him into a weapon at that instant would lock his erasures in place for good. The threat makes him cough the Legs and Teeth Devils back up, restoring her ability to talk and walk.

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The Legs Devil embodies the very concept of legs and was eventually overpowered and enslaved by the Death Devil as one of her pawns. Its brief but striking role unfolds during the War Devil arc.
After Denji swallows the Legs Devil's effigy, legs are stripped from creatures across the world, leaving them unable to move. The act also robs Yoru of everything below her waist in the middle of battle.
The full form of the Legs Devil has never been shown in the source material. Likewise, nothing about its character or temperament has been revealed.
At an unstated time, the Death Devil overpowered the Legs Devil and pressed it into her service as a brainwashed pawn. She later handed it to Denji as one of several Devil pawns while he pretended to ally with her.
Yes. Yoru forces her arm into Denji's mouth and warns that turning him into a weapon would lock his erasures in place for good, making him cough the Legs and Teeth Devils back up. This restores her ability to talk and walk.
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