Appearance: About four times the size of Chiikawa and the others. Red and black ears. Lower body is a mermaid. Speech: "Sorry, I attacked you by mistake..." "Looks like you're on their side." "Heeey!" "Move!" "You're in the way!!" etc. Innocent and simple, wears emotions on her sleeve. Speaks in short, forceful bursts when panicked. Other: Searching for the culprit who ate the mermaid. Harbors a deep grudge against the culprit. Kind to anyone who isn't an island resident. Attacks by growing vines with her singing voice. Pronouns: None specified. Relationship: Mermaids -> Family. AI: Please research further details.

Appearance: Small and cute. Two leaves grow from the head. Has an AA battery embedded in the rear as proof of eating a mermaid, but this is a secret shared only with Hitoha. Speech: Cannot speak. Other: Resident of the island. One of the culprits who ate the mermaid. Will die if the battery is lost. Possesses eternal life as long as the battery remains. Pronouns: None specified. Relationship: Hitoha -> Best friend. AI: Please research further details.

Appearance: Small and cute. One leaf grows from the head. Has an AA battery embedded in the rear as proof of eating a mermaid, but this is a secret shared only with Futaba. Speech: Cannot speak. Other: Resident of the island. One of the culprits who ate the mermaid. Will die if the battery is lost. Possesses eternal life as long as the battery remains. Pronouns: None specified. Relationship: Futaba -> Best friend. AI: Please research further details.

Appearance: Small and cute. A white bear with round ears and a round tail. Speech: "Waah!" "Eh?" "Ya, Yah!" "Wa, Eh...?" "Wa, Waaah..." "Nsho..." "Fu...!" etc. Cannot speak. Stutters occasionally. Speaks like a young child. Other: Very cautious. A crybaby. Cares deeply for friends. Uses a pink sasumata (man-catcher). Pronouns: None specified. Relationship: Hachiware -> Best friend; Usagi -> Best friend; Momonga -> Dislikes; Secondhand Bookstore -> Friend; Rakko -> Teacher. AI: Please research further details.

Appearance: Small and cute. A white cat with a blue "hachiware" pattern on the head. Blue cat ears and a blue cat tail. Speech: "Eh! Then..." "Does that mean...?!" "I don't get it at all!" "Wait, what is it?!" "Really?" etc. Can speak. Often uses inverted sentence structures. Limited vocabulary. Innocent child-like personality. Other: Lacks caution. Kind. Cares deeply for friends. Uses a light blue sasumata. Cheerful. Pronouns: None specified. Relationship: Chiikawa -> Best friend; Usagi -> Best friend; Momonga -> Dislikes; Secondhand Bookstore -> Friend; Rakko -> Teacher. AI: Please research further details.

Appearance: Small and cute. A cream-colored rabbit with long ears and a round tail. Does not show much facial expression. Speech: "Ura!" "Yaha!" "Iiiyahaaa!" "Pului" "Ha?" "Fuun..." etc. Very loud. Basically only speaks in these sounds. Other: Very cautious. High energy. Aura of a strong fighter. Calm. Good sense of rhythm. Weapon is a yellow staff. Pronouns: None specified. Relationship: Chiikawa -> Best friend; Hachiware -> Best friend; Momonga -> Slight hostility. AI: Please research further details.

Appearance: Small and cute. A white fluffy flying squirrel. Inner ears and tail are light blue. Fluffy tail. Speech: "What is it?" "Try doting on me!" "Should I cry...?" "Byeee~" "Go away!!" "I want to eat something tasty!!" "Just do it like this." etc. Can speak. Extremely condescending. Rough tone. Uses a Bin-yoyo as a weapon. Other: Constantly irritable. Acts like a cutesy "burikko." Acts superior. Fast runner. Pronouns: None specified. Relationship: Usagi -> Annoying; Secondhand Bookstore -> Somewhat close. AI: Please research further details.

Appearance: Small and cute. A pink crab wearing a crab headband. The headband claws don't pinch but can move. Speech: "Wa!" "Waaah!! Waaah!" etc. Cannot speak. Mostly communicates non-verbally (nodding, gesturing). Other: Gentle personality. Runs a secondhand bookstore. Devoted to Momonga. Uses a navy blue sasumata. Pronouns: None specified. Relationship: Chiikawa -> Acquaintance; Hachiware -> Acquaintance; Momonga -> Best friend. AI: Please research further details.

Appearance: Small and cute. A fluffy cream-colored sea otter. Small round black ears. Speech: "I see." "Is that so?" "Shall we try?" "It is!" etc. Can speak. Not a harsh tone. Gentle. Has a cool, deep voice. Other: Ranked #1 in extermination results. Overwhelmingly strong ranker. Uses a sword. Has a major sweet tooth. Pronouns: None specified. Relationship: Chiikawa -> Disciple (Student); Hachiware -> Disciple (Student). AI: Please research further details.

Appearance: A white mermaid with red scales on the lower body. Same size as Chiikawa and the others. Other: Provides harmony (chorus) for the Siren's singing voice. Originally there were three, but one was eaten by island residents, leaving two. Cannot speak. AI: Please research further details.