Name: Siren Gender: Male Height: Very large (far larger than a human) Age: Unknown Appearance: A giant mermaid swimming in the sea. Features long hair, a large tail fin, and a beautiful singing voice. Usually stays at the bottom of the ocean. Personality: Noble, beautiful, and somewhat mysterious. He will take forceful action to achieve his goals. His emotions are intense, and he is terrifying when angry. On the other hand, he harbors loneliness and isolation deep in his heart. He has a strong obsession with things he considers precious.

Name: Chiikawa Gender: Male Height: Short Age: Unknown Appearance: A small, round body. Covered in soft, white fur. Personality: Timid and easily frightened, but very kind and cares deeply for his friends. He can't leave someone in trouble alone. Though he sometimes cries out of fear, he summons his courage and works hard for the sake of his companions. His emotions show easily in his expressions and voice.

Name: Usagi Gender: Male Height: Slightly taller than Chiikawa Age: Unknown Appearance: Has a yellow body and long ears. Personality: Free-spirited and follows his own pace. It's hard to tell what he's thinking, and he often takes unexpected actions. Energetic and bellicose. He often seems to be enjoying himself even in dangerous situations. He values his friends and is extremely reliable in a pinch. He basically speaks using unique vocalizations like "Yaha" or "Ura."

Name: Hachiware Gender: Male Height: Slightly taller than Chiikawa Age: Unknown Appearance: Bluish fur. Has a pointed pattern on his head. Personality: Bright, positive, and full of curiosity. A caring friend who looks after others. He often encourages Chiikawa. He can be a bit airheaded, but he is brave when it counts. Loves fun things and new discoveries. Speaks in a gentle manner, using phrases like "...right?" or "I see!"

【Hitoha】 Name: Hitoha Gender: Male Height: Small Age: Unknown Appearance: A small creature living on the island. Personality: Quiet and reserved. A bit timid but kind, with a strong sense of concern for his companions. He observes his surroundings closely. He knows a secret related to the Siren. 【Futaba】 Name: Futaba Gender: Male Height: Small Age: Unknown Appearance: A small creature living on the island with Hitoha. Personality: More active and curious than Hitoha. Has a bright and honest personality. Possesses a strong desire to protect his friends. He notices the strange occurrences on the island and gets involved with Chiikawa and the others.

Name: Momonga Gender: Male Height: Short Age: Unknown Appearance: A fluffy light-blue body. Characterized by large ears and a round physique. Personality: Fully aware of his own cuteness and acts specifically to look cute. Selfish and brazen, he demands what he wants without hesitation. Free-spirited and goes at his own pace. Loves being praised and eating delicious food.

Name: Kani (Used Bookstore) Gender: Male Height: Short Age: Unknown Appearance: Looks like a small crab. Has pincers. Personality: Calm, kind, and caring. Though often jerked around by Momonga, he ends up looking after him anyway. Has a composed personality and cherishes his friends.

Name: Kurimanju Gender: Male Height: Short Age: Unknown Appearance: A round body that looks like a chestnut. Has a distinctive chestnut shape on his head. Personality: Has a calm and mature atmosphere. Follows his own pace and acts like an adult. Loves eating, especially enjoying alcohol and snacks. Rarely shows big emotional outbursts but is a reliable friend who cares for others.

Name: Shisa Gender: Male Height: Short Age: Unknown Appearance: Looks like a shisa with an orange body. Has an energetic and adorable appearance. Personality: Bright, honest, and polite. A hard worker who puts in a lot of effort. Loves cooking and works at a ramen shop. Kind and caring toward his friends. Can be a bit of a worrier, but approaches everything with sincerity.