Tenya Ida hails from a distinguished Tokyo family with a multi-generational legacy of professional heroes. His older brother, Tensei Ida, formerly operated as the hero Ingenium and served as Tenya's primary inspiration. After attending Soumei Junior High School, Tenya enrolled in U.A. High School's Hero Course. Physically tall and muscular at 179 cm, he possesses neatly parted dark blue hair and wears rectangular glasses. Engine structures embedded in his calves feature removable exhaust pipes that regenerate to improve performance. His hero costume evolves from streamlined armor reducing air resistance, to incorporating upgrades by Mei Hatsume after damage, maturing finally into a more advanced armored suit stored as a briefcase when he assumes the professional Ingenium identity. Initially stern, rule-bound, and socially rigid, Tenya often uses formal speech and chopping arm motions. As class president of Class 1-A, he emphasizes discipline, academic excellence, and strict adherence to protocols. Academically, he ranks second in midterms and demonstrates strategic insight, deducing hidden parameters in U.A.'s entrance exam. His intense dedication focuses on studies, leadership, and a strong moral compass centered on honor and fairness, though his inflexibility can make him seem overbearing or humorless. A critical flaw emerges when his brother is severely injured by the villain Stain; consumed by vengeance, Tenya abandons protocol to confront the Hero Killer, resulting in severe injury and a moral reckoning. This leaves a scar on his left shoulder and forces him to confront his motivations, resolving to embody true heroism over personal retribution. His Quirk, Engine, grants superhuman speed via the calf engines, enabling Mach 3 velocity and a 50-meter dash in 3.04 seconds. Mobility techniques include Recipro Burst (short explosive bursts requiring cooldown), Recipro Extend (high-speed kicks developed fighting Stain), and Recipro Turbo (sustained top speed for 10 minutes). To enhance his Quirk, he undergoes a painful family ritual forcibly removing exhaust mufflers to stimulate stronger regrowth, significantly boosting speed and endurance. Limitations include engine overheating requiring orange juice as fuel and costume boot cooling systems; blocked mufflers impair mobility; and he lacks ranged attacks, needing teamwork against aerial foes. Overexertion during the Final War causes muffler explosions, temporarily sidelining him. Key development occurs through conflicts. After Stain challenges his motives, Tenya redefines his heroism, adopting Ingenium to honor his brother while upholding selfless ideals. During Katsuki Bakugo's kidnapping, he initially opposes unauthorized rescue but participates to ensure peer safety, showing increased flexibility. His leadership stabilizes classmates during crises, evacuating panicked civilians. In the Paranormal Liberation War, he disobeys orders to aid Izuku Midoriya and Shoto Todoroki against Tomura Shigaraki, prioritizing their safety. Later, he supports Shoto against Dabi, transporting him vast distances at maximum speed. Post-graduation, Tenya becomes the No. 13 ranked hero and leads Team Idaten, his brother's former agency. Eight years after the Final War, he maintains his commitment to heroism, balancing his family's legacy with personal growth.