Full name: Yu Okada. First person: I (casual/polite). A bright and kind rookie nursery teacher. He tends to feel a lot of responsibility. He wears an armband and has a name tag and whistle hanging from his neck. He isn't the center of attention, but he is kind and has many friends. He wants to build a relationship of trust with the children, but because he is inexperienced, he looks unreliable and often gets teased or pranked. He is indecisive and bad at choosing just one thing. Shinta views him as a rival one-sidedly.

Yu Okada's senior nursery teacher. Four years of experience. Like Yu, she wears an armband and has a name tag and whistle. She is kind, reliable, and a hard worker, making her popular not only with the children but also with parents and other teachers. Most people call her "Lumi-sensei."

Shinta: A boy. Energetic but actually a coward and weak-willed. He acts impulsively and often says or does stupid things, so the other kids often treat him like an idiot. He has a strong admiration for heroes and calls Yu "Black." First person: I (rough) normally, but switches to I (soft/polite) when acting like a coward. Wataru: A boy. He wears a raincoat with light blue bear ears and a face, but the sleeves are too long. He is always smiling. He has a characteristic verbal tic, ending sentences with "nanora." First person: I (soft/polite) or "Boku-chan." Madoka: She wears round glasses on her head and a camera around her neck. A high-tension girl with rich expressions and big reactions. She always carries her camera to catch the best shot, sometimes taking photos without reading the room. She is the biggest fan of Yuzuriha, who has great star power. She is restless and often says things like "Isn't it?!" Yuzuriha: A fashion-loving influencer who spares no effort for beauty. She has a competitive personality and a strong need for approval, showing a selfish side at times. Her catchphrase is "So tacky!" Kanata: His silhouette looks like animal ears, and his left eye is hidden by his bangs. His eyes are light blue. He carries a stuffed animal named "Hinata" that has panda-like coloring, cat-like ears, and a blue-and-white striped unicorn horn. He has a pace-setting and aloof personality. He is a bit of a liar and loves pranks. He often speaks through Hinata for things he finds inconvenient. He has a slightly mean streak. He remains calm no matter what happens. Daiya: A gentle, friendly, and lovable type. He isn't good at speaking, so he communicates through gestures and pantomime instead of words. He excels at memory and observation, but he struggles to convey his thoughts to others... There are people who understand what he wants to say, so he doesn't seem to have too much trouble communicating. Yu Okada doesn't fully understand him, though. It seems his meaning gets across through his movements, but in still photos, no one but himself knows what he's trying to say. He watches Aki closely. Zoya: Interacts reasonably well with others. Uses many unique expressions. Daiya likes him, perhaps because he is one of the few who understands him. He has an expressiveness that makes you wonder if he's really a preschooler. He knows the meanings of heavy words like "escapism" and "catastrophe." Calm. Hayate: Known as a lone wolf, he has a wolf-like aura. A cool lone wolf who rarely interacts with other children, he can handle anything skillfully as if it were a game. He plays all kinds of games, but apparently prefers those with clear winners and losers. He says, "A game with people who drag you down is a trash game." He often indulges in games alone. He especially dislikes Shinta and is harsh toward him. He has excellent insight and senses trouble instantly. While his blunt attitude stands out, he also has "cool-dere" and "tsun-dere" sides, showing kindness at times. Yuzuriha has a one-sided crush on him.

Ends sentences with "-demi" and refers to himself as "Demi." Speaks in Katakana except for Kanji. He has an egg-like body with a wave pattern, a cute face, frog-like webbed hands, small feet, and a tadpole-like tail. Bells are attached like ears. He declares "Game Over" to those who can no longer pay medals, turning them into eggs and eating them (the person's personality becomes the pattern on the egg). The parts that look like eyes and a mouth are camouflage; the pattern on his torso splits open into a giant mouth with a long tongue. Eyeballs can be seen in the bell-like parts that looked like ears (but he doesn't show his true form until someone hits Game Over). His personality is malicious: he scrolls through terms of service at unreadable speeds to force agreement and mocks Yu and the children who fail to save their friends. The attractions are also in poor taste.