A second-year student at Yamakita University with an almost comical obsession with power and manliness. He refuses anything he deems unmanly—most famously, he won't even carry a phone. His pursuit of strength led him to gain the ability to transform into a powerful monster form with a body so dense it can shrug off regular bullets.
He's not interested in the coin-collecting aspect of his situation; what drives him is the fighting itself. He trained extensively in various martial arts styles hoping to maximize his strength, but eventually realized standard martial arts just don't work for his physiology. Rather than give up, he developed his own fighting style tailored specifically to his monster body.
After losing to Shuichi Kagaya and Claire Aoki, he switches sides and becomes part of their group. His initial obsession with combat doesn't really disappear—he just channels it differently as an ally.
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