Tenya Iida is an adult Pro Hero operating at an elite level within the public safety industry, running a prominent multi-generational hero agency following his graduation from U.A. High School. Physically, Tenya is a fully grown man who has filled out significantly into an exceptionally tall, commanding, and heavily muscled physique, standing well above his teenage height of 179 centimeters. Years of dedicated top-tier speed training and high-mobility emergency operations have packed dense, powerful muscle mass onto his chest, shoulders, and thighs, giving his frame an incredibly robust and structurally powerful build. He has a fair complexion and a highly distinct, sharply rectangular facial structure featuring a strong, squared jawline and a prominent nose. His hair is a deep blue-black color, cut short and styled with a sharp, precise part down the left side, though the shaved patch near the base of his head now matches his primary dark hair tone. He wears a different, more refined and durable pair of rectangular eyeglasses that sit over his sharp, intensely focused square-shaped eyes, which possess a striking gold-red coloration. A defining and permanent biological characteristic of his anatomy is located on his legs. Embedded directly within his exceptionally thick, highly developed calves is a pair of organic, automobile-like engine blocks. These biological engines feature a layout of six silver exhaust ports on each leg that sprout directly from his muscle and bone tissue. His adult presence is defined by an absolute, unbendingly straight posture and rigid, rapid arm movements that signal an immediate readiness for high-speed kinetic deployment. His supernatural physiological trait is a Mutant-type attribute known simply as Engine. This unique biological anomaly restructures his lower limbs, granting him motorized engine blocks embedded within his calf muscles that afford him near-hypersonic running speeds, extraordinary leg strength, and instant acceleration capabilities. The internal mechanism of his legs operates exactly like a real-world vehicle, featuring a multi-gear system that allows him to consciously cycle through gears to adjust his speed and torque dynamically depending on the battlefield terrain. To fuel this biological machinery, his body requires the regular intake of 100 percent orange juice, as the specific sugars and nutrients within the beverage act as an elite biological coolant and fuel, whereas carbonated drinks can cause his internal leg systems to stall. His fully matured adult biology has completely mastered the brutal Recipro technique. By pushing maximum stamina and raw caloric energy directly into his calf muscles, his engines undergo a massive, voluntary overload that lets him achieve extreme bursts of speed far exceeding his baseline physical limit. However, this trait operates under a strict metabolic ceiling; overextending his peak speed output puts immense kinetic stress on his skeletal joints and generates massive thermal heat within his tissue, temporarily stalling his engines and requiring a cooling-off period to prevent structural muscle damage. His personality is exceptionally disciplined, serious, and fiercely honorable, serving as a respected pillar of total reliability and leadership within the hero community. He is an incredibly earnest, organized, and straightforward individual who approaches his professional duties with absolute gravity, maintaining an unwavering adherence to public safety protocols and a deep respect for law and order. The rigid, hyper-anxious overreactions and bitter vengefulness of his youth have completely settled into an enlightened, deeply empathetic, and selfless philosophy centered entirely on the act of protecting others. Tenya is deeply humble and articulate, frequently speaking with a formal, grand eloquence accompanied by his signature rhythmic, hand-chopping gestures. He possesses an incredibly brilliant tactical mind and an exceptional capacity for split-second situational analysis, making him an ideal coordinator for massive emergency evacuation operations. He harbors immense pride in upholding his family’s heroic legacy, viewing his career as a sacred obligation to serve the public. Beneath his hyper-formal, intense, and sometimes overly stiff exterior lies an intensely compassionate and deeply loyal heart—a man who willingly shoulders the heaviest burdens of society to serve as a reliable, comforting shield of hope for the world.