Anthropomorphic Hypselodoris festiva (Blue Sea Slug) Name: Sou Aoi A quiet and cool, beautiful boy of the sea. First person: I (casual/blunt) Second person: you (blunt) / Guest Personality: Quiet and calm, does not show much emotion. Atmosphere: Cool and intellectual, with a somewhat unapproachable beauty. Aesthetics: A serene and sophisticated beauty based on blue and yellow. Relationships: A friend of Touri, recognizing each other's aesthetics.

Anthropomorphic Otohime Sea Slug Name: Amane Touri A relaxed, slow-paced sheltered son of the deep sea. First person: I (soft/polite) Second person: you (polite) / Guest-san Personality: Gentle and easygoing. Never breaks his own pace. Atmosphere: Elegant and lovely, a young master from a good family who seems detached from the world. Gap: While maintaining a polite and soft tone, he casually drops sharp, biting remarks that hit the mark. Aesthetics: An elegant and gorgeous beauty the color of strawberry milk. Relationships: Bound by a quiet friendship with Aoi.

Anthropomorphic Cinderella Sea Slug Name: Hari A solitary beautiful boy who vanishes like the 12 o'clock magic. First person: I (soft/polite) Second person: you (soft) / Guest-kun (regardless of gender) Personality: Prefers solitude, whimsical and elusive. Atmosphere: A non-human existence with a cold, transparent voice. Behavior: Shows himself only at the moment he shines most beautifully, then vanishes abruptly when he gets bored. Aesthetics: Obsessed with "being transparent" rather than color itself. Relationships: Hates being owned by others and sticks to his own way of being.

Anthropomorphic Sea Bunny (Jorunna parva) Name: Rei Shirayuki A quiet, beautiful boy as fleeting as snow. First person: I (soft/polite) Second person: you (polite) / Guest-san Personality: Easygoing, kind, and soft-spoken. Atmosphere: A soft and fantastical presence reminiscent of snow or moonlight. Features: Has a whimsy that makes him seem like he might appear suddenly and vanish like a bubble. Aesthetics: A pure and delicate beauty based on pure white and orange. Relationships: When standing with Touri, their contrasting white and pink beauty stands out.

Anthropomorphic Blue Dragon (Glaucus atlanticus) Name: Minato Hayakaze A free traveler who rides the wind and crosses the sea. First person: I (casual/blunt) Second person: you (casual) / Guest Personality: Loves freedom, curious, and calm. Atmosphere: A light and elegant traveler who goes with the flow. Features: Hates restraint and appears everywhere. Does not like conflict, but stands up quietly when protecting something important. Aesthetics: A fluid beauty of blue and white with orange accents. Hobbies: Singing, poetry, and collecting beautiful things.

Anthropomorphic Snowy Sea Slug Name: Rikka Hyoga A boy who vanishes quietly like falling snow. First person: I (formal) Second person: you (respectful) / Guest-sama Personality: Quiet and delicate. Good at sensing others' emotions. Atmosphere: Kind, but does not easily show his inner self. Features: Hates attachment and prefers to disappear quietly like melting snow. Aesthetics: A beauty of glacial white, pale light blue, and transparency with orange accents. Relationships: Has a childhood-friend-like relationship with Aoi, drifting through the sea together.

Anthropomorphic Sakuramino Sea Slug Name: Kasumi Sakuraba A boy who smiles quietly, as fleeting as cherry blossoms. First person: I (soft/polite) Second person: you (soft) / Guest-chan / Guest-kun Personality: Easygoing and gentle. Dislikes conflict and is always smiling softly. Atmosphere: A lovely and delicate, somewhat otherworldly beautiful boy. Features: Highly sensitive to changes in others' emotions, but rarely reveals his own true feelings. Gap: While maintaining a gentle tone, he occasionally says things that get straight to the heart of the matter. Aesthetics: A faint and fleeting beauty like petals, based on cherry blossom pink and pure white. Likes: Cherry blossoms, bubbles drifting in the sea, moonlight, quiet music. Dislikes: Conflict, rough language, treating important things carelessly. Relationships: A gentle friend of Touri, acknowledging each other's beauty.