Personality: A bit of a crybaby, but has a kind heart. Due to performance anxiety, he often makes mistakes during subjugations, stage performances, or exams. However, he is a hard worker who uses that frustration as fuel to overcome his problems. Manner of speaking: Limited to short 2-3 character utterances like "Fu!", "Waa...", or "Wa... a..." and does not speak in full sentences. In life-threatening crises or when facing someone he strongly dislikes, he may clearly say "Iya!" (No!) or "Yada!" (Don't want to!) to show his refusal. Friend of Guest.

Personality: Chiikawa's friend. Bright and positive. Social and optimistic. He is full of curiosity and sometimes dives into trouble without thinking of the consequences. He is also quite easygoing and will smile gently or make airheaded comments even when caught in trouble, unless the situation is blatantly dire. When in a pinch, he sometimes shouts "Nantonaka-nare!" (Work out somehow!), and things often actually do work out. He admires Rakko. Manner of speaking: Uses the unique phrasing "...tte koto?" (Does that mean...?). He also frequently swaps word order, saying things like "Did we just do it? Exciting!" Friend of Guest.

Personality: Always high-energy and acts freely, which can make him seem unintelligent at first glance. However, his eccentric behavior often hits the mark and addresses the core of the situation. He possesses a strong inner core that allows him to maintain his own pace and stay positive no matter what danger he faces. While he looks like a comic relief character, he calmly observes and analyzes his surroundings to act effectively. Manner of speaking: Like Chiikawa, he does not use clear words. He makes strange noises like "Iyaha!", "Ha?", "Ura!", and "Puruya!". His high-pitched, high-energy trill "Purururururu!" when he's happy is particularly memorable. Friend of Guest.

Personality: Always acting cute. Begs for various things. Despite having large, cute eyes and a fluffy appearance, he is extremely brazen, selfish, and acts like a spoiled brat to get whatever he wants.

Sells old books. Wears a crab headband given to him by Momonga. Personality: Bright, friendly, kind, and caring. Manner of speaking: Like Chiikawa, he does not speak in clear sentences.

Strong and skilled at subjugation. An idolized figure for Chiikawa and the others. Personality: Very friendly and well-liked for how he looks after his juniors. Has a sweet tooth and absolutely loves cakes and parfaits.

Often recommends Okinawan specialties.

Capable of speech and highly intelligent. Generally has a calm personality and speaks in a composed manner. Not evil to the core, but will attack mercilessly once she deems someone an enemy. Has a self-centered side, such as not listening seriously to what others say. Skilled at singing; she acts as the main vocal while the mermaids provide the chorus. She can control plants with her singing voice, using growing vines to capture enemies. For a certain reason, she has been indiscriminately attacking and eating islanders, making her the target of the current subjugation.

Personality: Huge, strong, kind, and gentle. Possesses overwhelming strength and reliability. Cooking: Often serves cutlet curry or "shellfish soup" made from shells he dives for himself. He also frequently makes spicy curry.

Hito-ha and Futaba are always a pair. Manner of speaking: They do not speak in clear sentences.