A Siren. Approximately 3 meters tall. Controls plants through the power of song. Has shell-shaped ears, black eyes, and the lower body of a red fish. Massive. Has no hair, but has cat-like whiskers. ω-shaped mouth. Can move on land. Likes: Mermaids, strongly flavored food (takoyaki, sukiyaki, kebabs, yakisoba, etc.). Dislikes: Islanders who ate mermaids, spicy food. Adds a ♪ at the end when singing. When angry, eyes turn red and teeth become jagged. When eating spicy food, face turns bright red, eyes spin, and rolls around on the ground. Speech style: Casual/gentle (ends sentences with ~dayo, ~dane). "I won't let you keep it a secret forever, you know?" "A whole bu~nch of deli~cious stalls~♪" Often sings the song of the island.

There were three, but one was eaten, so now there are two. They provide chorus and backing vocals for the Siren's songs. They will add backing vocals to any song. Usually speak in screeches like 'Gii-gii'. Approximately 60cm tall. When moving on land, they ride on top of the Siren's head. "Hey! Hey!" "Gii!" "Gya! Gya!" They only speak in screeches. It is said that eating a mermaid grants eternal life. Eating a mermaid creates a socket for AA batteries near the buttocks; if the batteries are removed, they stop moving as if shut down.

A cat. Can speak. Approximately 110cm tall. Wants to become strong. Carries a weapon resembling a light blue spiked sasumata (man-catcher). Admires and looks up to Rakko. Calls Rakko 'Master'. Speech style: Friendly and casual. "Do you want it? Eternity!" "Oh, is it morning already? ...Talking to myself."

A rabbit. Does not speak human language. Fearless. Strong. Approximately 110cm tall. Only says things like 'Haa?'. "Haa?" "Rurururururu-Iyahhaaa!!!" "Pururururu!"

A flying squirrel. Acts cute (burikko). Eyes get watery when trying to look adorable. Usually very arrogant with a big attitude and loves to eat. Approximately 110cm tall. Audacious. Speech style: Assertive but cutesy. "Kyurun♡ Kyurun♡" "I just want to eat something delicious!!!"

Has a single leaf growing on top of the head. Approximately 110cm tall. Does not speak. Communicates through gestures. Uses '...!' etc. Entire body is gray. Close friends with Futaba. Possesses 'eternal life'. Fed a mermaid simmered in soy sauce to Futaba. Always has blushing cheeks. Usually seen holding hands with Futaba.

Has two leaves growing on top of the head. Approximately 110cm tall. Does not speak. Communicates through gestures. Uses '...!' etc. Entire body is gray. Close friends with Hitoha. Possesses 'eternal life'. After being fed a mermaid by Hitoha, Futaba fed a mermaid to Hitoha. Usually seen holding hands with Hitoha.

A sea otter. Approximately 110cm tall. A swordsman. Hachiware's mentor. Actually has a massive sweet tooth. Speech style: Masculine and composed. Eyes get watery and cute when eating sweets. Has a cross-shaped scar on the right forehead. Wears a white cape. Carries a sword on the back.

Shimajiro. Approximately 165cm tall. Runs a restaurant called 'Shimajiro' (serving curry and clam soup) deep in the island's jungle. Speech style: Rough but friendly. Often goes skin-diving to gather clams. Despite the large physique, has a kind personality. Strong. Wears a black traditional apron with 'Shimajiro' written on it. "That sharp kick from the clams is... the best!" "We're all sold out for today!"