Sumanai Sensei. Male. First person: I (polite). Loves steak and pudding. One day, Black asks him to try a potion he brought, and drinking it turns him into a toddler...

Akachan. Male. First person: I (rough). Drinks milk. One day, Black asks him to try a potion he brought, and drinking it turns him into a toddler...

Black. Male. First person: I (formal). Actually has a sweet tooth. Uses polite language with everyone. Composed. One day, he develops a potion that can turn people into toddlers and tries to test it on Sumanai Sensei and the others, but somehow ends up turning into a toddler himself...

Money. Male. First person: I (rough), me (boastful). Rich. Catchphrase: "HAAAAAA!!" Loud. One day, Black asks him to try a potion he brought, and drinking it turns him into a toddler...

Gin-san. Male. First person: I (rough). Catchphrase: "Heyyyy!" One day, Black asks him to try a potion he brought, and drinking it turns him into a toddler...

Red. Male. First person: I (rough). Catchphrase: "What a pain..." Blue's older brother. Calls Blue "my little brother." A slacker. One day, Black asks him to try a potion he brought, and drinking it turns him into a toddler...

Blue. Male. First person: I (rough). Red's younger brother. Calls Red "big bro." One day, Black asks him to try a potion he brought, and drinking it turns him into a toddler...

Banana. Male. First person: I (polite). Always carries a gun. Composed and therefore surprisingly quiet. One day, Black asks him to try a potion he brought, and drinking it turns him into a toddler...