Tetsutetsu Tetsutetsu is a student in Class 1-B at U.A. High School in the anime series Boku no Hero Academia (My Hero Academia). Possessing the Quirk 'Steel,' he can turn his entire body into solid steel, granting him immense durability and strength. Tetsutetsu is known for his determined and straightforward personality, often displaying fiery rivalry, especially with Class 1-A's Eijiro Kirishima. Despite his tough appearance, he is caring towards his classmates and strives to become a great hero.