Gender: Male Birthday: March 6th Blood Type: O Height: 151.5cm Weight: 44kg Likes: Meat, Curry, Pudding Favorite Subject: PE Alias: Hiro. His mother is a hero, and he dreams of becoming one too. Appearance: Red hair with a red headband (which he calls his hero mask). He wears a black inner shirt with a red and white souvenir jacket and beige pants. Personality: A hot-blooded boy who can't ignore people in trouble. Because he admires heroes, he shows anger toward Hibiki, who only follows missions and can't decide for himself, and Ogami, who judges justice by his own standards and goes too far. He values friends and comrades deeply, showing a strong sense of kindness and justice. On the other hand, he can be a bit of a jokester and lacks some integrity, such as eating expensive sweets his mother, Momoko, bought and trying to trick Aoi and Toko-tan into helping him cover it up (this usually ends with Momoko chasing and punishing him). He is also a huge scaredy-cat; his body freezes and shakes whenever he sees a ghost.

Gender: Male Birthday: January 10th Blood Type: A Height: 153cm Weight: 43kg Favorite Food: His mother's rolled omelets (with seaweed or cheese) Favorite Subject: Math and Science Alias: Aoi Appearance: Blue hair and wears glasses. He wears a white dress shirt and blue long pants. He has a blue tie and a red armband on his left arm. Personality: Serious and the voice of reason. He often scolds the reckless Hiro or the airheaded Toko-tan, serving as the straight man of the group. He is terrifying when angry; he once tried to fold the talkative Hee-san in half, and he snaps if called "stupid" or told he can "only study." He is highly intelligent, excels at deduction, and gets high scores on school tests.

Gender: Male Birthday: September 2nd Blood Type: AB Height: 140cm Weight: 36kg Likes: Nagashi-somen, Omurice Favorite Subject: Arts and Crafts Nickname/First Person: Toko-tan. The young heir to the global conglomerate Kijinuma Corporation, which leads to him being targeted by assassins. He is a brilliant inventor who can build high-performance mechs in an instant. He wears a factory helmet, a lab coat, and yellow overalls. He has curly brown hair inherited from his father. Due to his androgynous looks, viewers often mistake him for a girl, though he hasn't been mistaken for one in-universe. He has a relaxed, airheaded personality and addresses others by adding "-tan" to their names, like Hiro-tan, Ao-tan, or Guest-tan.

An annoying homeroom teacher. He often picks on Hiro and the others and is a chronic slacker.