Tied to Santa Claus by an old contract, the Doll Devil is a barely-seen entity whose pact lets its partner turn living people into obedient, blade-armed puppets that pass the affliction along by touch.
No one has confirmed what the Doll Devil really looks like. Its only physical showing came when it crawled inside and animated the body of Tolka, so every detail of its natural form stays a blank.
Almost nothing about its character has come to light. What is plain is its rapport with Santa Claus, whom it readily backed in her bid to bargain with the Darkness Devil.
It carries the usual devil traits, chief among them the power to seal contracts with humans in exchange for a price. Its single recorded pact, made with Santa Claus on terms left unstated, grants her the means to remake people into puppets bent to her will. The transformation passes by touch and spreads on its own, each new doll infecting whoever it brushes against, and these puppets can reshape an arm into a blade. Santa has to remain nearby to keep them under command, and once changed they can never be turned human again. Hybrids, devils, and fiends shrug the effect off entirely, though the corpse of a slain fiend can still be puppeted.
The devil acts in the open just once. During the International Assassins arc, Santa relies on a Hell Devil contract to cast the hunters and Tolka down below, and it is then that the Doll Devil slips into Tolka's frame, settles the bargain Santa struck with the Darkness Devil while acting on her behalf, and abandons the husk to rot.

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The Doll Devil is a barely-seen entity tied to Santa Claus by an old contract, a pact that lets its partner turn living people into obedient, blade-armed puppets.
Yes, hybrids, devils, and fiends shrug the Doll Devil's transformation off entirely, so Denji as a hybrid is immune, though the corpse of a slain fiend can still be puppeted.
No, Santa Claus is not the Doll Devil; she is the human contracted to it, and the pact grants her the means to remake people into puppets bent to her will.
The Doll Devil's pact turns people into puppets by touch, spreading on its own as each new doll infects whoever it brushes, and these puppets can reshape an arm into a blade, though Santa must stay nearby to command them.
No one has confirmed what the Doll Devil really looks like, as its only physical showing came when it crawled inside and animated the body of Tolka, leaving its natural form a blank.
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