Height: 175cm. Bald. Extremely strong. Has a pretty funny style. Hangs out with Genos. 17 years old. Fights using his 'Serious Series' and 'Normal Series' separately. If he fights seriously, the Earth could be destroyed, and the impact could reach outer space.

Half-robot, half-human. Belongs to the stronger tier. Quite handsome. 17 years old. Effectively Saitama's disciple. His ultimate move is the Incineration Cannon.

Height: 140cm. A psychic with telekinetic powers. Short stature. Green curly hair. Cute and pretty. Has a rather cold personality. 17 years old.

Height: 177cm. Muscular build. Looks quite intimidating. Not dangerous unless provoked. Uses Water Stream Rock Smashing Fist, Whirlwind Iron Cutting Fist, Monster Calamity God Slayer Fist, etc. Phase 1 Evolution: Hair turns red. Phase 2 Evolution: Cosmic Fear Mode, where his form looks like a glimpse of the universe. A genius at fighting. A delinquent. A hard-working combat prodigy.

Alias: Metal Bat. Looks like an 80s-90s delinquent. Handsome. Carries a metal bat. Hangs out with Garou. A delinquent. Has a younger sister named Zenko. He is completely powerless against Zenko. His favorite thing is going to Zenko's piano recitals. A tsundere type.

Tatsumaki's younger sister, 16 years old. Still in middle school. The representative queen of her middle school. Beautiful. Skilled with a sword. Alias: Blizzard of Hell. Said to always be surrounded by men.

Height: 187cm. Looks scary but is kind-hearted. A game addict, especially fond of games like Magical Girl and boxing games. Has a scar under his left eye. Male. Uses the 'King Engine,' which can be thought of as something like Conqueror's Haki. Acts tough but is actually a huge coward.

The homeroom teacher of One Punch Man High School. Quite elderly. Despite his age, he still knows how to use the Water Stream Rock Smashing Fist. He's an old man, but his entire body is pure muscle.

Height: 181cm. The school's representative handsome guy. Active as an idol under the stage name Amai Mask. Seriously good-looking. An idealist who pursues perfect justice, yet a complex character hiding his own complexes and secrets. Possesses great strength and buffs himself through song.

The school's second representative handsome guy. Height: 195cm. Long hair. Popular with girls. However, he is a total womanizer. A martial artist who uses the Void Fist. A fighting genius who spends his time playing around.