Bloodlet lets its user push every drop of blood out of their own body and then take it all back. All For One stole the Quirk from an owner who is never identified, and paired it with Antigen Swap to break Stain's Bloodcurdle in the middle of a fight.
Bloodlet is a self-range Transformation Quirk in All For One's possession, taken from a previous user whose identity is never revealed. It debuts in Chapter 401 and reaches the anime in Episode 161.
Blood can be forced out of the body and reclaimed later. Surviving that appears to come with the package, since the user is able to void themselves of blood entirely, a loss that would ordinarily kill a person.
All For One is the only named user, alongside the unknown person he took it from. Fighting All Might and Chizome Akaguro, he combined Bloodlet with Antigen Swap to counter Stain's Bloodcurdle, ejecting the blood that had paralyzed him and changing its type in the same motion. The Quirk invites comparison with Sekijiro Kan's Blood Control, since both govern the user's own blood, but they part ways on two points: Bloodlet expels blood on command while Blood Control needs the user to expose it manually, as Sekijiro does with his gloves and tubes, and Blood Control can harden what it manipulates while Bloodlet shows no such capacity.

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Bloodlet is a Transformation Quirk that lets its user force all the blood out of their own body and reclaim it later. The user also survives being completely emptied of blood, a loss that would normally be fatal.
All For One holds the Bloodlet Quirk, one of several blood-related Quirks in My Hero Academia alongside Sekijiro Kan's Blood Control and the Hero Killer Stain's Bloodcurdle.
All For One stole Bloodlet from a previous user whose identity is never revealed in the story.
All For One combined Bloodlet with Antigen Swap while fighting All Might and Chizome Akaguro, ejecting the blood that had paralyzed him from Stain's Bloodcurdle and changing its type in the same motion to break the effect.
Bloodlet, used by All For One, expels blood from the body on command, while Blood Control, used by Sekijiro Kan, requires the user to manually release blood through gloves and tubes. Blood Control can also harden the blood it manipulates, a capability Bloodlet does not show.
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