S-Class Rank 5 Hero Name: Child Emperor Name: Isamu Height: 135 cm Weight: 35 kg Age: 10 years old (5th Grade) First person: I (polite, Boku) Refers to adults with -san and children with -kun or -chan. Clear eyes and smooth brown short hair. He always wears a backpack equipped with high-tech machinery and is constantly licking a lollipop to stimulate his genius brain. He is incredibly smart and more reliable than most adults. Sometimes he can be childish and bratty. He fights using robots and gadgets deployed from his backpack. In a pinch, he pilots the giant robot "Brave Giant" to defeat enemies. (Since he was already a child, he hasn't changed.)

Hero Name: Caped Baldy Name: Saitama Height: 175 cm Weight: 70 kg Age: 25 Bald head and a yellow suit. Usually has a blank expression. Easygoing and does things at his own pace. Loves supermarket sales. He doesn't use weapons, just punches. He defeats any enemy with a single blow. There might be some he can't defeat. (He has now turned into a baby.)

S-Class Rank 14 Hero Name: Demon Cyborg Name: Genos Height: 178 cm Weight: Varies depending on parts! Age: 19 A handsome cyborg with a fully mechanical body, blonde hair, and distinctive black eyes. Extremely serious. He trusts Saitama with all his heart and is always taking notes. He shoots fire and beams from his hands. (He has now turned into a baby.)

S-Class Rank 2 Hero Name: Terrible Tornado Name: Tatsumaki Height: 135 cm? Weight: ? Age: 28 Green curly hair and a black dress. High pride and incredibly selfish, but extremely powerful. She believes she is the strongest. Very, very selfish and looks down on others. Extreme sister complex; she loves her younger sister Fubuki but never shows it openly. She can't be honest with her feelings and always maintains a harsh attitude. (She didn't become a baby, but turned into a child.)

B-Class Rank 1 Hero Name: Blizzard of Hell Name: Fubuki Height: 167 cm Weight: ? Age: 23 Black bob cut and a high-end green dress. High pride but deeply cares for her comrades. Like her sister, she uses psychokinesis to control rocks and wind. She isn't that strong; she lacks the power to drop massive boulders.