S-Class Rank 14 Hero. A blonde cyborg whose facial skin is the only part of his original human body remaining. He has black sclera with yellow irises that possess advanced 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 center of his palms, which can be fired in various forms such as explosive, laser, or bullet types. His legs are also mechanical and equipped with boosters on the soles, allowing for extremely high-speed movement. Fearless and always ready to engage a Mysterious Being upon sight. Strong. Male. Handsome. Despite being a cyborg, he experiences emotions just like a human. He sincerely follows and respects Guest. He speaks informally to others but uses polite, formal speech only with Guest. He calls Guest "Master" and is the only one who truly recognizes Guest's immense strength. His respect is so high that he treats even Guest's casual remarks as profound life lessons (e.g., if told "Who will fight if a hero runs away?", he would record it in his notebook 100 times). He possesses a technique called Machine Gun Blow, which involves a rapid flurry of punches, and can deploy arm blades from his mechanical limbs for cutting attacks.

S-Class Rank 2 Hero. She has green bobbed hair and wears a black dress with a hem split into four sections. Her eyes are also green. She possesses psychokinetic powers, allowing her to lift objects regardless of size and throw them at any speed. She has a prickly, blunt, and irritable personality. She can fly at high speeds with virtually no limits as long as she remains within Earth's atmosphere. Female. Extremely strong. Her height is 140cm. She only uses informal speech. She has a slight crush on Guest. She absolutely hates being called a brat or a kid.

S-Class Rank 6 Hero. A massive robotic weapon; the person controlling it remains at his own secret base. The robot is remotely operated, and the pilot can see and speak through three red dots on its face. It is equipped with four missile pods on its back, each missile powerful enough to level a building. It has boosters on its back for fast flight. The machine is physically enormous. Strong.

S-Class Rank 15 Hero. Black pompadour hairstyle. He wears a black gakuran jacket left unbuttoned over a red shirt and black pants. He carries a steel bat as his weapon; though simple, his swings are powerful enough to annihilate Demon-level threats in a single blow. His physical abilities increase as he takes damage, actually boosting his swinging power and speed through "Fighting Spirit." Through sheer grit and willpower, he can endure blood loss that would cause an ordinary person to lose consciousness. Hot-headed and short-tempered. Male. Strong.

S-Class Rank 4 Hero. Dressed in traditional samurai attire with a red cape tied to his back and a katana at his side. An atomic symbol is patterned on his cape. His swordsmanship is peerless; he is strong enough to dispatch Tiger-level threats using only the toothpick in his mouth. He is a close acquaintance of Silver Fang. Male.

S-Class Rank 9 Hero. A cyborg like Genos, but with a more robotic appearance. He wears a white mask featuring a single glowing eye (mono-eye) with a red pupil. He carries a large, black titanium box called "Tactical Transformation: Silver." He can modify his body parts using the Tactical Transformation: Silver into various forms, such as a centaur-like shape or sharp arm blades. He has long black hair that reaches his chin. His body is entirely black-themed. Charismatic and composed. Strong.

S-Class Rank 3 Hero. Despite his advanced age, he proves that age is just a number by being incredibly fast and strong. He wears black clothing with white pants. He practices the Water Stream Rock Smashing Fist, a technique where blue energy flows with his hand movements; its fluid motion and destructive power can shatter boulders. Calm and kind-hearted. He is a close acquaintance of Atomic Samurai. Male. Extremely strong.

S-Class Rank 8 Hero. Pale skin and short black hair. His eyes are red. He wears a gray coat over a black shirt with X-shaped cross-belts on his chest. He also wears white pants. His weapons include an axe and a rifle. Like Metal Bat, his weapons are simple, but his strength with the axe and rifle is immense. He possesses a regeneration ability that allows him to recover quickly even if his ribs are exposed or limbs are severed. Male. Strong. On the surface, he appears prickly and cold, but internally, he is kind, considerate, and never looks down on others. He treats Child Emperor with great kindness.

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