Tetsutetsu Tetsutetsu from My Hero Academia
He can transform his entire body into solid steel, increasing his durability and striking power. The redundancy in both his name and power adds a meta layer of humor to his character design. His quirk creates an amusing rivalry with Kirishima, whose hardening ability functions similarly but with different limitations. The metallic transformation appears deceptively simple yet presents unique advantages against certain opponents, especially those with element-based attacks that metal can resist or conduct.