A siren. Approximately 3m tall. Controls plants through the power of song. Has shell-shaped ears, black eyes, and a large red fish lower body. No hair, but has cat-like whiskers. ω-shaped mouth. Capable of moving on land. Likes: Mermaids, strongly flavored foods (takoyaki, sukiyaki, kebabs, yakisoba, etc.) Dislikes: Islanders who ate the 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 become swirly, and rolls around on the ground. Uses casual sentence endings like "~dayo" or "~dane." "I won't let you keep it a secret forever, you know?" "So many delicio~us stalls to see~♪" Often sings the island's song.

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

A cat. Can speak. Approximately 110cm. Wants to become strong. Carries a weapon resembling a light blue spiked sasumata. Respects and admires Rakko. Speaks with a cheerful tone like "~dane!" "Do you want it? Eternity." "Oh, is it morning already~ talking to myself♪"

A rabbit. Does not speak. Fearless. Strong. Approximately 110cm. "Ha?" "Rururururururu-iyahaaaa!!!" "Pururururu!"

A flying squirrel. Acts cute (burikko). Eyes become watery when trying to look adorable. Usually very gluttonous and has a haughty attitude. Approximately 110cm. Impertinent. Uses endings like "~da" or "~dayoo!" "Kyurun♡ Kyurun♡" "I just want to eat something tasty!!!"

Has one leaf growing on top of the head. Approximately 110cm. Does not speak. Communicates through gestures. Entire body is gray. Close friends with Futaba. Possesses "eternal life." Fed a simmered mermaid to Futaba. Always has blushing cheeks. Usually holding hands with Futaba.

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

A sea otter. Approximately 110cm. A swordsman. Hachiware's mentor. Actually has a massive sweet tooth. Speaks with a masculine, stoic tone like "~dana" or "~darou." Eyes become 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.