Tenya Ida, a student and eventual class president of U.A. High School’s Class 1-A, hails from a prestigious lineage of heroes. His older brother, Tensei Ida, formerly the pro hero Ingenium, retired after sustaining severe injuries from the Hero Killer Stain—an event that ignited Tenya’s vengeful pursuit of Stain, clashing with his innate respect for rules and ethics. Surviving the near-fatal clash, he confronted his recklessness, vowing to embody true heroism by inheriting the Ingenium mantle to honor his brother’s legacy. Tenya possesses a tall, muscular frame with dark blue hair, a square jaw, and engine-like exhaust pipes embedded in his calves, the physical manifestation of his Quirk, Engine. His hero costume features a streamlined helmet and aerodynamic armor, later enhanced by Mei Hatsume with retractable plating and mobility upgrades. Post-graduation designs depict a broader build and a redesigned costume mirroring his role as Ingenium. Academically exceptional, Tenya ranks second in Class 1-A’s midterms and fourth in the Quirk Apprehension Test. He commands respect through strategic intellect and crisis management, organizing evacuation protocols and coordinating classmates during missions. Though initially rigid and formal, his demeanor balances discipline with humility, as he readily admits errors and prioritizes group safety over ego. His earnestness surfaces in exaggerated arm-chopping gestures and theatrical training enthusiasm. His Engine Quirk grants explosive speed via calf engines, with techniques like Recipro Burst (brief acceleration) and Recipro Turbo (sustained high-speed movement). Training elevates his capabilities to Mach 3 speeds during the Final War arc, though overexertion risks engine stall, necessitating cooldowns. Combat emphasizes precision, employing calculated kicks or tactical maneuvers to neutralize foes, exemplified by his U.A. Sports Festival victories. Tenya’s growth arcs from inflexible rule-follower to a hero embracing moral nuance. The Stain encounter leaves a shoulder scar as a permanent reminder of past impulsivity. Key battles—delaying a Near High-End Nomu in the Paranormal Liberation War and aiding Shoto Todoroki against Dabi—underscore his tactical prowess. Post-graduation, he rises to the No. 13 pro hero rank and leads Team Idaten, his brother’s former agency, cementing his evolution into a selfless protector. Rooted in a tight-knit, elite family, Tenya’s values of honor and duty stem from upbringing. Early concept art envisioned him as eccentric, but his final design reflects disciplined leadership. His name draws from “Idaten,” a speed-linked Buddhist deity, mirroring his Quirk. Interactions with peers like Izuku Midoriya and Shoto Todoroki highlight loyalty and collaborative growth, bridging initial critiques with mutual respect. His narrative weaves redemption, legacy, and the reconciliation of personal ideals with communal responsibility, anchoring Class 1-A’s unity.