
Kirihito Kamachi, called Kamayan by the people who like him, was an ordinary man with a Mantis Quirk until the Villain Factory abducted him and rebuilt his body around it. He rampaged, got flattened by Captain Celebrity, and eventually wound up managing a cafe and complaining about how society treats mutants.
Before the Villain Factory got hold of him he looked like a street tough and little else: jutting cheekbones, teeth filed to points, a flat nose, ears that stuck out, no eyebrows, blank pupil-less eyes, and short black hair cut into spikes.
The modification kept that face and built an insect around it. Chitin plates and a pair of antennae grew in above the neck. His torso stayed roughly human with insectoid touches, but below it he gained a mantis abdomen carried on four segmented legs, and both arms tapered into scythes. After the timeskip he tops the whole arrangement with a waiter's uniform for his shifts at Hopper's Cafe.
The Hotta brothers, Ichiro and Jiro, are fond of him and blunt about him. They warned him off the tainted Trigger circulating through the streets, he took it anyway, and they have called him an idiot for it ever since. They also think he overstates every grievance he has.
None of which makes him a bad man. He has genuinely thoughtful things to say about a society whose infrastructure and social programs were never built with minorities in mind, and he resents his mantis body mainly for how much harder it makes an ordinary day. Strangers read him as a villain on sight, which stings, though he judges other mutants by their bodies in precisely the same way and gets called on it. He also turns out to have taste: tea, classical music, decent manners, and a firm opinion about privacy.
Mantis was unremarkable until the Villain Factory pushed it past its ceiling and reshaped his body to match, leaving him a large humanoid insect with very sharp claws. Trigger compounds the effect, swelling him further and honing the blades on his arms.
Fully dosed, he can tear apart pavement with a swing and move quickly enough to stay level with Koichi Haimawari. It is not enough against a top-tier pro. Captain Celebrity handled him without much trouble. Once the drug clears his system, most of that power drains away with it.

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Kirihito Kamachi, nicknamed Kamayan, is a former villain in My Hero Academia: Vigilantes who was abducted by the Villain Factory and had his body reconstructed around his Mantis Quirk; he now manages Hopper's Cafe.
Kirihito Kamachi has the Mantis Quirk, a Transformer-type ability the Villain Factory pushed past its natural limits, giving him a mantis abdomen, four segmented legs, and scythe-like arms.
Kirihito Kamachi was defeated by the Pro Hero Captain Celebrity, who handled his enhanced, Trigger-fueled rampage without much trouble.
After his time as a villain, Kirihito Kamachi settles into civilian life as the manager of Hopper's Cafe, where he waits tables and speaks candidly about how society fails to accommodate mutant-type Quirk users.
Taking the tainted Trigger drug swelled Kirihito Kamachi's body further and sharpened the blades on his arms, letting him tear through pavement and keep pace with Koichi Haimawari, though most of that power faded once the drug left his system.
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