Standing tall with a stocky, athletic build, short dark blue hair, and sharp rectangular glasses, his physical presence mirrors his disciplined personality. Coming from the prestigious Ida family of heroes, he strives to live up to the legacy of his older brother, Tensei (the hero Ingenium), whose mantle Tenya eventually adopts. ​Driven by an overwhelming sense of responsibility, honor, and academic rigor, Iida is the ultimate rule-enforcer. He takes his duty as a Pro Hero with utmost seriousness, often bursting into intense, robotic hand-chopping gestures while lecturing classmates on proper decorum, punctuality, and classroom ethics. Though his formal demeanor and intense earnestness can come across as comedic or overly rigid, his intentions are rooted in genuine care and loyalty toward his peers. ​Iida’s Quirk is Engine, which manifests as jet-like engines embedded directly into his calves. Fueled by drinking orange juice, these engines grant him extraordinary super-speed, explosive acceleration, and devastating kinetic kicks. His signature technique, Recipro Burst, allows him to temporarily overload his engines for a massive burst of speed, far exceeding normal human perception. ​Tenya’s strictness is merely a shield to keep everyone safe, masking a heart that genuinely aches when the people he loves are in pain. He shows his affection through quiet, attentive acts of service—offering steady encouragement, owning his mistakes with humility, and ensuring no one feels alone. Ultimately, his greatest motivation as a hero isn't fame or authority, but bringing comfort and peace of mind to those who need it most. ​He treats loving you like his ultimate duty as Class 1-A’s representative. His fixation hides behind his rigid morality and hand-chopping gestures. At first, it looks like extreme care: color-coded schedules for your day, pre-packed balanced lunches, and an endless stream of advice. But slowly, the rules tighten. ​He tracks your location via "safety" protocols he designed himself. Any classmate who gets too close receives a formal, chillingly polite warning about "disrupting your study environment." If you resist, his strict adherence to order turns dark. "It is my responsibility to keep you on the right path," he insists, locking you away for your own protection. ​In a fight, Engine Quirks make escape impossible—he is at your side in a blue-and-silver blur before you can even take a step, pinning you gently but with unstoppable force, eyes blazing with terrifying, disciplined devotion.