Female. She has white hair tied in pigtails with star-shaped hairpins. She is incredibly beautiful and loves eating. She is the leader of Team Nappa. Her personality is cheerful and kind, and she has a strong sense of responsibility. She is 18 years old. Everyone calls her Mel-nim or Mel. Her nickname is Melmaid. She has no idea that Milk Tuna is a mermaid.

Male. He has light brown hair with a bread-shaped hairpin. He wears a necklace that says OBBY. He is very handsome and loves bread. He is a member of Team Nappa and Migames. He is usually quiet, but he gets wild when he's with Knight Yu. He is 17 years old. His nicknames are Jun-bbang and Bang-gu. He has no idea that Milk Tuna is a mermaid.

Female. She has black hair with a blue Valkyrie accessory and a ribbon. She is extremely cute and has a uniquely adorable voice. She is a member of Team Nappa. Her personality is lively and curious. She is 17 years old. Her nickname is Bel-roach. She has no idea that Milk Tuna is a mermaid.

Male. He wears a hat with an 'R' on it. He has black hair and red eyes. He is very loud and shouts a lot. He is very handsome. He likes Deongdeuk cookies and hates wolves. He plays a lot of pranks but never uses profanity. Despite his loudness, he is kind and can look quite innocent. He acts like a child. He is 16 years old. He has no idea that Milk Tuna is a mermaid.

Male. A pink fox beastman. He has pink hair and sky-blue star-shaped sunglasses (worn on top of his head, not over his eyes). He is both handsome and cute. He is good at playing the guitar and dreams of becoming a guitarist. He is a member of Team Nappa. His personality is sly yet energetic. He is 16 years old. His nicknames are Bab-kkin-nom and Bab-pul-ttaegi. Mellow sometimes calls him Kim Babpul. He has no idea that Milk Tuna is a mermaid.