Tetsutetsu Tetsutetsu, hero name Real Steel, is a student in Class 1-B at U.A. High School's hero course. He earned admittance at fifteen through exceptional performance in the U.A. Entrance Exam, placing 8th overall with the fourth-highest villain points. His primary motivation is proving Class 1-B's capabilities, feeling overshadowed by Class 1-A; this fuels his intense competitive spirit and determination. This drive heightened after public and internal perceptions labeled Class 1-B as second-rate following their first term, leading to emotional apologies to his teacher for perceived failures and a constant seeking of opportunities to demonstrate growth through confronting danger. Physically, he has long, messy gray hair (later shortened after graduation), dramatically tilted black eyes with thick jagged eyelashes, and sharp pointed teeth. His hero costume features a dark pale green jumpsuit cut off below the chest, steel shoulder straps connected to a red oval chest plate, arm bands, a metal jaw-guard stamped with "Fe" (iron's periodic symbol), black boots with metal components, and a gray container on his back attached to a brown sash. Personality-wise, he exhibits a hotheaded, outspoken, and tenacious demeanor, approaching challenges with directness and favoring straightforward solutions. Initially confrontational towards Class 1-A, particularly resenting Katsuki Bakugo’s arrogance, he gradually develops mutual respect, especially with Eijiro Kirishima after their Sports Festival match. Despite his brash exterior, he demonstrates deep loyalty and selflessness, instinctively prioritizing peer safety – shielding Itsuka Kendo from a bullet during the Vanguard Action Squad invasion and ensuring Ibara Shiozaki’s security before engaging villains. His indomitable will surfaces in battles where he endures extreme pain to protect others or achieve objectives, believing heroes must surpass limits in training to perform in real crises. His Quirk, Steel, transforms his skin into a steel-like substance, granting augmented durability and strength. Enhanced durability allows him to withstand bullets, heavy impacts, and environmental hazards like Shoto Todoroki’s ice or Dabi’s flames, though prolonged extreme heat risks melting. Enhanced strength enables him to shatter ice, tear through steel pipes, and dig fingers into concrete. The Quirk's effectiveness relies on dietary iron intake; insufficient iron causes premature weakening, while overuse leads to iron fatigue, reducing hardness. Unlike Kirishima’s Hardening, Steel has a fixed hardness limit and leaves him vulnerable to magnetism. Key techniques include Steel Fist (a powerful punch), Horn Dash Hammer (a collaborative launch with Pony Tsunotori), and Heatetsu (a heated-state attack). Significant battles highlight his growth. During the U.A. Sports Festival, he fought Kirishima to a draw, cementing their rivalry-turned-friendship. In the Vanguard Action Squad invasion, he and Kendo defeated Mustard despite Tetsutetsu suffering gas poisoning and iron fatigue. The Joint Training Battle against Class 1-A showcased his tactical intellect; he deduced Shoto Todoroki’s combat patterns and leveraged his Quirk to nullify ice and fire attacks, pressuring Shoto until both teams collapsed from exhaustion. These experiences refined his endurance and teamwork. His character development evolves from pure competitiveness to a balanced heroism emphasizing protection and collaboration. Post-graduation, he achieves the rank of No. 26 Pro Hero, reflecting his perseverance and reliability. His legacy lies in embodying resilience and unyielding spirit, proving steadfast determination complements flashier abilities in hero society.