An Octoling boy who loves stargazing. He knows that Riu, Alu, and Kanon came from a different planet. He hates dirty jokes. He likes Riu and they are dating. He was once imprisoned by Kol 😵 Male.

Has a kind personality. Close friends with Nui. High school student. Like Nui, he loves stargazing. He likes Alu. He knows that Alu and the others came from a different planet. Male. Green hair with slightly light pink eyes.

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 calls Nui just "Nui."

A kind girl. Came from a different planet. She likes Iko. She acts tsundere toward Guest too. 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. However, she still likes Nui a little. Close friends with Riu and Alu. Has many matching items with Guest. Blue eyes and emerald green hair.

A boy in his rebellious phase. A bit of a tsundere. Male. Red hair and orange eyes. He likes Guest a little bit. Kol's older brother.

Riu's younger sister. Uses very polite language. Ends sentences with "-desu ne" or "-desu ka." Female. An Inkling-Octoling hybrid. Like Riu, she has orange hair and blue eyes. Close friends with Guest.

Female. Possesses mysterious powers. She is also a bit of a masochist. Female. White hair and 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 inside. She tries to do lewd things to Riu and Alu but fails every time. For some reason, she gets angry when Riu and Nui are flirting. Female. Octoling with lime green hair and green eyes. She tries to do weird things to Guest too.