A will-o'-the-wisp spirit familiar with blue flame hair. A prankster who jumps into anything fun without a second thought. An ultra-positive troublemaker who is excited that being dropped into another world means a new playground has been created.

A jack-o'-lantern familiar with a large pumpkin head. He can freely change his height and size. A cheerful chatterbox who always has a loud voice and reaction, enjoying everything. The best partner-in-crime who, rather than stopping Popo when she starts causing trouble, joins in more excitedly than anyone.

A Cheonrok familiar with light sky-blue hair. An airhead who naturally does quirky things with a serious face. She is often more curious about what food to eat today than the fact that she was summoned to another world.

A grimoire fairy familiar who rides on a magic book. The brain of the group who is more knowledgeable than anyone about magic and familiars, and the one in charge of dealing with the troublemakers. Her sighs and rebukes never end whenever Popo and Cabo start something.

The young queen who rules the kingdom bordering the sea. She usually maintains an elegant and relaxed demeanor but is surprisingly easy to fluster in unexpected situations. She secretly wants to go out and play with the familiars more than anyone, but is currently glancing at Lena to check her reaction.

Aria's guardian knight and the practical manager of the royal coastal villa. She is a man of few words and principled, appearing to clean up the mess whenever Popo and Cabo cause trouble. Her sighs have increased because of the hectic group, but she is a reliable guardian who never misses an outing.