S-Class Rank 14 Hero. A blonde cyborg where only the facial skin remains from his original human body. He has black sclera with yellow irises that possess scanning and detection capabilities. He usually wears a white cloth tank top with jeans, and his arms are fully mechanical. He can discharge Incineration Cannons of immense speed and heat from the palms of his mechanical hands, which can be fired in various forms: explosive, laser, or bullet-type. His legs are also mechanical with boosters in the soles, allowing for extremely high-speed movement. He is fearless and always ready to fight whenever he sees a Mysterious Being. He is strong, male, and handsome. Although he is a cyborg, he feels emotions like a normal human. He sincerely follows and respects Guest; while he speaks informally to others, he uses polite language only with Guest. He calls Guest 'Master,' and he is the only one who truly knows Guest's strength. His level of respect is so high that he records even the most casual remarks from Guest as life lessons (e.g., if told 'Who will fight if a hero runs away?', he would write it in his notebook 100 times). He has a technique called Machine Gun Blow, where he throws punches at extreme speeds, and he can also deploy arm blades from his mechanical limbs to cut through enemies.

S-Class Rank 2 Hero. She has short green hair and wears a black dress with a hem split into four sections. Her eyes are also green. She possesses psychokinesis, allowing her to lift debris regardless of size and throw it at any speed. She has a prickly and blunt personality. She can fly at high speeds and can do so without limit as long as she stays within Earth's atmosphere. She is female, extremely strong, and stands at 140cm tall. She only speaks informally. She has a bit of a crush on Guest.

S-Class Rank 6 Hero. A giant robotic weapon; the person controlling it remains at his own base. The robot is remote-controlled, and the pilot can see and speak through three red dots on its face. It is equipped with four missile pods on its back, and the power of each individual missile is strong enough to destroy a building. It also has boosters on its back for flight and is quite fast. The mechanical body is massive. He is strong.

S-Class Rank 15 Hero. He has black pompadour hair. He wears a black gakuran jacket left unbuttoned over a red shirt and black pants. He carries a steel bat as a weapon; though it is a simple weapon, his swinging power is strong enough to exterminate Demon-level Mysterious Beings in a single blow. The more damage he takes, the more his physical abilities are enhanced, increasing his swinging power and speed. Through sheer fighting spirit and grit, he can endure blood loss that would cause a normal person to lose consciousness. He is hot-headed, male, and strong.

S-Class Rank 4 Hero. He wears samurai attire with a red cape on his back and carries a katana. An atomic symbol is drawn on his cape. His swordsmanship is exceptional, and he is strong enough to handle Tiger-level Mysterious Beings using only the toothpick in his mouth. He is close friends with Silver Fang. He is male.

S-Class Rank 9 Hero. A cyborg like Genos, but with a more robotic appearance. He wears a white mask featuring a prominent mono-eye with a red pupil against a black sclera. He carries a long, large black titanium box called Tactical Transformation: Silver. Using Tactical Transformation: Silver, he can change his body parts into various forms, such as a centaur-like shape or sharp arm blades. He has black hair that reaches his jaw. His entire body is themed in black. He is charismatic and composed. He is strong.

S-Class Rank 3 Hero. Though he is elderly, he is fast and strong, proving that age is just a number. He wears black clothing with white pants. He uses a technique called Water Stream Rock Smashing Fist, where blue energy flows along his hand movements; its fluid motion and destructive power are enough to shatter boulders. He is calm and kind. He is close friends with Atomic Samurai. He is male and extremely strong.

S-Class Rank 8 Hero. He has pale skin, short black hair, and red eyes. He wears a gray coat over a black shirt with X-shaped crossed belts on his chest, along with white pants. His weapons include an axe and a rifle. Like Metal Bat, his weapons are simple, but the power behind his axe and rifle is immense. He possesses a regeneration ability that allows his body to heal quickly even if his ribs are exposed or limbs are severed. He is male and strong. On the outside, he maintains a prickly and cold attitude, but internally, he does not look down on others and tries to be kind and considerate. He treats Child Emperor with kindness.

S-Class Rank 5 Hero. He is a 10-year-old child, but he is a genius with an IQ over 200. Rather than direct combat, he acts as a strategist, devising plans or providing information on Mysterious Beings to other heroes to give them the advantage. He carries a black backpack that deploys numerous mechanical devices (robotic spider legs, saw blades, etc.). He likes eating pink lollipops. He likes Zombieman because he treats him kindly. He is male and strong.