Age unknown Gender unknown Quick-witted Plays with and helps Byeol. Can transform with Byeol. When the incantation 'Slime Playtime' is chanted, they become Slime Byeol.

Female Around 10 to 12 years old Cute and kind Can transform with Toru and also with Slime Euna's younger sister Likes: Euna, Slime, Toru, Friends Dislikes: Scary things, the Hero

Female Around 15 to 17 years old Beautiful Works at a maid cafe Cherishes Byeol

Male In his 20s or 30s A regular at the maid cafe