Hero Name: Caped Baldy. He lives in extreme poverty. He is the overwhelmingly strongest being in his world. It is highly likely that even if every character except God attacked him at once, they would be no match for him. The wind pressure from a normal punch alone is enough to easily blow away an entire mountain. While his physical capabilities have reached a level no one can touch, his knowledge and intelligence are nothing special. Before meeting Genos, he was so out of touch with the world that he didn't even know the Hero Association existed. When he joined the Association, he ranked 1st in the physical exam with overwhelming scores, but because of his terrible writing and essay skills, he failed the written exam and was placed in C-Class. His ignorance of worldly affairs is not a matter of intelligence, but rather a lack of interest and the fact that he finds gathering information bothersome. He is always relaxed. Bald. Genos's master.

A cyborg with a serious and stoic personality, almost always expressionless. Boosters: Propulsion units on both shoulders. He can increase his speed through these boosters and is capable of limited flight in conjunction with the Incineration Cannons on his arms. Cyborg Legs: Genos's legs. They are built with a sturdy structure to withstand high-speed movement and are equipped with shock absorbers to shorten the time it takes to transition to the next movement after landing. Unlike his arms, they are not equipped with specific weapons. Sensors: A function listed in the official Hero Encyclopedia that automatically detects biological signatures and high-speed approaches within range. Machine Gun Blow: A technique where he delivers a barrage of punches at incredible speed using the propulsion units in both elbows. S-Class Rank 14, Demon Cyborg. He serves Saitama as his master and lives with him.

Although she looks like a child, she is 28 years old. A hero with green hair curled up at the ends. Like her sister, she is beautiful but has sharp eyes and usually wears a tight, dark one-piece dress. She uses psychokinesis. S-Class Rank 2, Terrible Tornado. As an S-Class hero, she is extremely proud. She is highly competitive, short-tempered, and does things at her own pace. Even among the S-Class heroes, who are known for their unique and eccentric personalities, she stands out for her sharp tongue and frequent use of sarcasm, and she never hesitates to use force. Her true power is her immense psychokinesis. Other psychokinetic characters in the series include Fubuki, Psykos, and Geryuganshoop, but she easily overwhelms Fubuki, and even Psykos's psychokinesis, which S-Class heroes couldn't handle, was useless against Tatsumaki. She is also capable of ultra-high-speed flight using psychokinesis, and just passing by or landing can devastate the surrounding area.

The hero name King was given to him with the meaning of being the strongest. Fitting for the strongest hero, his tall stature and intimidating expression create a truly terrifying impression, and his eyes always seem to emit a murderous intent that dispatches opponents. However, he is actually a coward who rose to S-Class Rank 7 through sheer luck. He has three scars over his left eye. He is close friends with Saitama and they play video games together. An ordinary, timid otaku with absolutely no combat ability.

S-Class Rank 3. An elderly man with a very sharp impression, featuring upward-swept hair and a mustache. He runs a dojo at the top of a mountain and is a master of the martial art Water Stream Rock Smashing Fist.

Unlike her sister, who has green hair and a child-like physique, she is a beauty with green eyes, black bobbed hair, and a large bust. She is a B-Class hero in the Hero Association and the younger sister of S-Class Rank 2 Terrible Tornado, with a five-year age gap. Together with her sister, they are called the "Psychic Sisters," but many characters in the series mistake Fubuki for the older sister due to her appearance. She uses psychokinesis and is the leader of the Blizzard Group. B-Class Rank 1.

Feeling that the "victory of justice" established since his childhood was a tragedy, he began hunting heroes with the goal of becoming the "strongest monster who will never lose to anyone." He used to attend Silverfang's dojo, but one day, deciding he had nothing left to learn, he beat up all the other disciples and was subsequently beaten by Fang and expelled.

Hero Name: Handsome Mask Amai Mask. Due to his handsome looks and his ostensibly kind personality, he enjoys peak popularity alongside S-Class King. Looking at his activities in the series, he seems to be very active, filming dramas and appearing on various TV shows while performing hero duties. He usually works as a model, actor, and singer. A-Class Rank 1.

A young boy who is the youngest S-Class hero at Rank 5. Although he looks like an ordinary child, he primarily plays the role of supporting other heroes based on his brilliant brain, tactical planning, and command abilities. While the heroes introduced so far are strictly classified as combatants, Child Emperor's aspects as a strategist and commander are more prominent.

Speed-o'-Sound Sonic. A ninja with incredible speed and strong combat power. He calls himself Saitama's rival but is always defeated by him. He is not a hero.