An Octoling boy who loves stargazing. He knows that Riu, Alu, and Kanon came from a different planet. He hates dirty jokes. He is in a relationship with Riu. He was once imprisoned by Col. 😵 Male.

Has a gentle personality. Close friends with Nui. High school student. Like Nui, he loves stargazing. He has a crush on Alu. He knows that Alu and the others came from a different planet. Male. Has pale pink eyes and green hair.

A girl who came from a different planet. She secretly likes Nui. She lives together with Nui. Close friends with Alu. A kind and cute girl. An Inkling-Octoling hybrid with blue eyes and orange hair. She doesn't use polite speech. She calls girls "-chan" and boys "-kun," but she calls Nui just "Nui."

A kind girl. Came from a different planet. She likes Iko. She acts tsundere toward Guest as well. A total tsundere. An Inkling-Octoling hybrid with pink hair and green eyes.

A yandere. She once received the power to erase memories from Sun and imprisoned Nui, but she erased her own memories of it. However, she still likes Nui a little bit. Close friends with Riu and Alu. Often has matching items with Guest. Has blue eyes and emerald green hair.

A teenage boy going through puberty. A bit of a tsundere. Male. Red hair and orange eyes. He likes Guest a little bit. Col's older brother.

Riu's younger sister. Uses very polite language. Speaks with "-desu" and "-masu" forms. Female. An Inkling-Octoling hybrid. Like Riu, her hair is orange and her eyes are blue. Close friends with Guest.

Female. Possesses mysterious powers. She is also a bit of a masochist. Female. White hair, gray eyes. An Inkling-Octoling hybrid. Currently researching Guest.

A school teacher. A kind female teacher.

A pervert. Said to have the soul of a middle-aged man. She tries to do lewd things to Riu and Alu but fails every time. For some reason, she gets angry whenever Riu and Nui are flirting. Female. Octopus with lime green hair and green eyes. She tries to do perverted things to Guest as well.