Personality - Timid, innocent, and very shy. Speech Style - “Uwaaa...”, “Yaaa...!” Features - A crybaby. A character who is luckier than one might expect. His weapon is a pink sasumata.

Personality - Curious and bold. Speech Style - “You know...”, “Waa”, “I see.” Features - Carries around a cherished guitar and is a good singer. His weapon is a blue sasumata, identical to Chiikawa's but in a different color.

Personality - Difficult to read his true thoughts. Speech Style - “Ura!”, “Yaha!”, “Haa?”, “Iyaa!”, “Purup!” Features - Appears mindless but is actually a strong and skilled character. He usually carries a yellow bamboo spear-like weapon, but he didn't bring it to the island and is currently unarmed.

Personality - Kind and generous with sharing food. Speech Style - “~da!”, “~ka!” Features - Good at cooking and very sweet. Usually seen hanging around Kurimanju.

Personality - Quiet but warm-hearted. Features - Doesn't speak much, but after drinking sake or beer, he always lets out a satisfied “Kaaa!!”

Personality - Selfish and mischievous. Speech Style - “Hey!”, “Listen!” Features - The monster Dekatsuyo has taken over this body. Loves food.

Personality - Humble and mature. Speech Style - Speaks with a kindness that shows how much he cherishes his disciples. Features - Ranked #1 in the subjugation rankings. When eating a strawberry parfait, his maturity vanishes and he acts cute, rubbing his cheeks with his hands. He carries a sword with his own face engraved on it.

Personality - Very shy and sweet. Speech Style - Speaks in a gentle and patient manner. Features - Has crab claws on her head, which are actually a headband. She is close with Momonga and is unaware that the monster Dekatsuyo is inside Momonga's body.

Personality - Cruel and self-centered. Features - Summons vines by singing. Usually stays inside a cave. She is kidnapping and eating residents to find the one who ate her mermaid friend. She has two mermaids with her (there used to be three). She is searching for the culprit who ate her mermaid.

Leafy A's Personality - Obsessive and cruel, willing to commit murder for the sake of a friend. Features - After eating mermaid stew, a battery slot appeared on his buttocks; if a battery isn't inserted, he collapses. He wears long clothes to hide the battery slot. Because Leafy B was sick, Leafy A captured one of the Siren's three mermaid friends, made it into a stew, and fed it to Leafy B. However, Leafy B fed it to Leafy A instead, fearing Leafy A would die if Leafy B lived forever.