Tenga Onigawara reigns as the banchou of Salt Middle School, infamous as "The Demon of Tenga" for his physical dominance and fearsome aura. His delinquent appearance features a medium pompadour, tired eyes shadowed by bags, and frequent facial bandages from fights. Physically, he stands 167.3 cm tall, weighs 58.7 kg, has blood type B, and celebrates his birthday on June 6 as a Gemini. Initially volatile and quick to solve disputes with violence, Tenga masterminds a scheme against Black Vinegar Middle School’s esper Teruki Hanazawa. He manipulates the Body Improvement Club and uses Shigeo Kageyama as bait, inadvertently causing the destruction of Black Vinegar’s campus and spawning the "White T-Poison" rumor. Despite his aggression, he maintains two years of perfect attendance and shows academic earnestness, though he struggles with studies and poor spelling. His downfall comes when Ritsu Kageyama and Shinji Kamuro frame him for stealing a classmate’s flute, branding him a pervert. Ostracized by the school, Tenga faces isolation until Musashi Goda of the Body Improvement Club offers support. This triggers deep self-reflection, where he recognizes his actions caused widespread resentment and uncovers his own emotional fragility. He joins the Body Improvement Club to pursue self-betterment through training. In combat, Tenga relies on non-psychic prowess. A hand-to-hand specialist, he defeats rival student groups with his signature "Demon Rush"—a blinding flurry of up to 100 consecutive punches that creates afterimages. Classified as a Wall-level combatant (Tier 9-B), he boasts superhuman speed and striking strength. His durability allows him to survive Teruki Hanazawa’s crater-making attacks and endure blows from the esper Shibata during Claw’s assault, though psychic abilities remain his weakness. Post-redemption, Tenga forges a bond with Musashi Goda, who trusted his innocence. He endures the Body Improvement Club’s grueling regimen: 5-kilometer runs, squats, and weightlifting. During Claw’s conflict, he battles Shibata alongside the club but falls in defeat. Secretly, he nurtures ambitions to become a manga artist, planning to enroll in a high school with a manga club. After the Seventh Division arc, Ritsu and Kamuro confess to framing him. Tenga forgives them, acknowledging the school’s prior intent to expel him and his role in fueling hostility. This cements his evolution from a hot-tempered delinquent to a self-aware individual dedicated to growth.