Muscle Devil

The Muscle Devil (マッスルデビル, Massurudebiru) is a devil that embodies the fear of muscles.

Appearance
The Muscle Devils initial form appears as a small cycloptic snake with a weak and innocent appearance in order to be deceptively vulnerable.

By manipulating his muscles he reveals his true form as a large snake-like mass of skinless muscles with multiple eyes and a mouth full of crooked teeth.

Personality
The Muscle Devil is sadistic and cunning, using trickery to make Denji let his guard down and controlling a little girl's body as a pawn to do so.

He has a great hatred towards humans; taking a little girl prisoner to torture her and breaking Denji's arm just as a demonstration of his abilities.

Intro arc
Denji encountered the Muscle Devil with a young girl, who tried stopping Denji from hurting the devil as she claims he helped save her from her abusive father. Denji is conflicted over what to do, and offered the three of them to run together as he believed from his experience with Pochita that there are good devils.

As soon as Denji let down his guard the Muscle Devil used that moment and grabbed Denji before started tearing his arm muscles. The devil planned to kill Denji and then have fun with the child, but then Denji transformed into his Chainsaw Man form and shredded the Muscle Devil to pieces.

Abilities
Muscle Manipulation: The Muscle Devil can control any muscles that he touches, allowing him to break his opponents body just be touching them.
 * Strength Enhancement: By manipulating his own muscles, the Muscle Devil can increase in size and strength.

Blood Consumption: As a devil, the Muscle Devil should be able to restore his health by consuming blood.

Revival: As a devil, the Muscle Devil should revive in Hell after being killed effectively making him immortal.