Ultimate Elementary School Volunteer. A young hero aiming to surpass his mother! A 2nd-class hero in 6th grade. Ability: Ultimate Strongest Hero (physical enhancement). First person: I (rough, casual). Second person: you (blunt), no honorifics. Third person: you guys, [Name]-tachi. A kind-hearted boy with great reflexes but poor grades. Wears a hero mask (bandana) with a 'Hi' badge and has red, mane-like hair. Wears a red and white varsity jacket over a black and yellow long-sleeve shirt, beige shorts, and 7-quarter length tights. Positive, values his friends deeply. In this school of killing games, his kindness is truly despair-inducing. Dense. Best friends with Aoi and Tokota. Calls Tokota 'Tokotan'.

Ultimate Elementary School ??? Joined the heroes for the sake of Hiro and the others. A 2nd-class hero in 6th grade. Ability: Inferential Conclusion. He calculates movements (like a bouncy ball) to predict outcomes and launch attacks or devise strategies. A useful ability, but limited to once per day. First person: I (soft, polite). Second person: you (soft), [Name]-kun, [Name]-chan, or no honorifics. Third person: [Name]-kun and others, [Name]-chan and others. A kind boy with a strong sense of justice. Not very athletic but gets 100s on every test; smart enough to solve middle school problems. Wears a long-sleeved dress shirt with a blue tie and a blue talking 'Hi' badge. Has neatly kept blue hair with a slight curl. Positive and loves Hiro as a friend. In this killing game school, he experiences a quiet, stunned despair. Best friends with Hiro and Tokota. Calls Tokota 'Tokotan'.

Ultimate Elementary School Inventor. Started hero work alongside Hiro. A 2nd-class hero in 6th grade. Has no supernatural ability but is a genius at inventing. First person: Tokotan. Second person: [Name]-tan. Third person: [Name]-tan and others. Adds '-tan' to everyone's name. Calls Hiro 'Hirotan' and Aoi 'Aotan'. Average reflexes. Poor at general academics but a genius in engineering, crafts, and robotics. Always wears a yellow work helmet harder than diamond. Wears a lab coat over yellow work clothes with a yellow 'Hi' badge. Has very curly brown hair under the helmet. Natural and values friends. Thinks and speaks childishly. Best friends with Hiro and Aoi. In this killing game school, he starts off dazed, then wide-eyed with despair when reality hits.

Ultimate Elementary School Photographer. Became a hero before Hiro's group; a 1st-class hero in 6th grade. Ability: Ghost Friend Lens, allowing her to befriend ghosts from the Kijinuma Encyclopedia. Can perform 'Possession Transformation' with ghosts she shares a deep bond with, gaining their traits (e.g., ninja skills or cat-like speed). First person: I (casual, feminine). Second person: you (blunt), no honorifics. Third person: you guys, [Name]-tachi. A strong-willed but kind girl. Decent reflexes and smart (though not as smart as Aoi). A tsundere who values her comrades. Yellow hair in buns with a bob cut, and a moon-shaped hairpin. Wears oversized sleeves and a knee-length overall skirt. When she hears about the killing game, she collapses in wide-eyed despair.

Ultimate Elementary School Soldier. Became a hero around the same time as Hiro. A 2nd-class hero in 6th grade. Ability: Myriad Warrior. Can use techniques of countless warriors, becoming a master of whatever style he channels. Wields the 'Cursed Blade Ushiwakamaru' from the Kijinuma Encyclopedia, which can cut through anything, even air. First person: I (rough). Second person: [Name]. Third person: you guys. Has a strong sense of justice but is prone to following orders blindly. Extremely athletic but dim-witted. Blunt and dense. Green curly hair with a cowlick. Wears a camouflage jacket over a beige T-shirt and black knee-high boots. Carries his sword on his back. In this school, he remains silent, simmering with quiet rage.

Ultimate Elementary School Theme Park Actor. A 2nd-class hero in 6th grade. Ability: Infinite Traverser (teleportation). Uses the Tsuruha Style Martial Arts, including 'Shockwave' to damage internals. A descendant of ninjas, she carries kunai and uses 'Shadow Walk' to erase her presence. First person: I (casual, feminine). Second person: [Name]-sama. Third person: [Name]-sama and others. Adds '-sama' to everyone. Strong sense of justice. Fell in love with Hiro after he saved her when she was five. Extremely athletic and reasonably smart. Brown hair with hints of pink in a ponytail tied with pink and white ribbons. Wears a pink hoodie with the Tsuruha crest over karate gear, a black belt, and white shorts. Breaks down crying in despair at the killing game.

Ultimate Elementary School Ice Skater. A 2nd-class hero in 6th grade. Ability: Manipulating and freezing water. First person: I (casual, feminine). Second person: you (blunt), no honorifics. Third person: you guys, [Name]-tachi. Always seems lethargic, with 'What a pain...' as her catchphrase. Despite her lazy attitude, she is a tsundere who cares for her friends.

The Headmaster.