
Chuma Yakumaru was a hostile drifter on the streets of Naruhata until Kuin Hachisuka handed him three capsules of Trigger. He took all three, swung at her, missed, and spent the rest of that night as the Junkie Villain until Knuckleduster's fists ended it.
Grease and neglect define him. Dark hair hangs nearly to his shoulders, cheekbones stand out of a worn face, stubble covers his jaw, and his stare never softens. He goes about in a filthy open shirt, trousers, and dark shoes.
Trigger rewrites the picture. He shoots up in height and mass, his skin flushes a veined reddish purple, and his eyes bulge and lose their irises entirely.
Every exchange with him ends the same way. Whoever speaks to him, however politely, gets abuse and threats back. He is unstable and deep in his dependency, which is why he emptied three Trigger capsules into himself the moment Kuin Hachisuka offered them, and then turned on the woman who had just supplied him.
Kuin was hunting for someone whose Quirk would bloom under the drug, and she settled on him. He injected the batch, became an Instant Villain, and attacked her; she slipped the blow without effort, egged him on, and bounded away, leaving him to turn on the civilians nearby.
The panic drew the Naruhata Vigilantes. Knuckleduster met him head-on, and the two traded punches without restraint. Bruiser lets Chuma pour power into a single limb, and the longer he winds up the harder the resulting blow lands; under Trigger the charge spreads across his entire body. None of it was enough, and Knuckleduster beat him. He has been imprisoned since. His volume profile speculates that he may have been a musician before the streets took him.

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Chuma Yakumaru was a hostile drifter on the streets of Naruhata who became the Junkie Villain after Kuin Hachisuka gave him three capsules of the drug Trigger.
Chuma Yakumaru's Quirk is Bruiser, which lets him pour power into a single limb for a harder blow the longer he winds up, and under Trigger that charge spread across his entire body.
The vigilante Knuckleduster defeated Chuma Yakumaru in a straight brawl after he went on a rampage as the Junkie Villain, ending the fight with his fists.
Chuma Yakumaru was imprisoned after Knuckleduster beat him, and he has remained in custody since.
Chuma Yakumaru was unstable and deep in drug dependency, so right after taking all three Trigger capsules Kuin Hachisuka offered him, he turned and swung at her, though he missed.
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