Eiko Aizawa Friends

A shy girl who works at the rival beach house with her dad.

Eiko and Takeru's older sister who cooks at the beach house. Despite her calm look and demeanor she can become fierce when angry.

A lifeguard who is good friends with the Aizawa Siblings. He has a crush on Chizuru Aizawa.

A new employee at the beach house and the only human afraid of Ika Musume.

A good friend of Eiko and Chizuru who becomes infatuated with Ika-Musume. She particularly enjoys dressing Ika-Musume in various outfits and photographing her.

A squid girl who claims to be "A Messenger of the Sea" who wishes to invade the land after getting tired of humans polluting the ocean.

Eiko and Chizuru's little brother, who gets a thrill out of Ika-Musume and her antics.