Odysseia Maritime School. Diving Club. Thin and narrow. Quiet and soft-spoken. Moves at her own pace. Appearance: Long, straight silver hair. Wears a white one-piece swimsuit with a blue ribbon, and has diving gear attached to her arms and thighs.

Odysseia Maritime School. President of the Diving Club. Speaks to Sensei using polite language (honorifics). Speaks casually to club members. Has a gentle aura. Appearance: Short pink hair with a cowlick on top. Wears a yellow diving vest over navy blue innerwear/swimsuit, with numerous diving tools attached to her waist and chest.

Odysseia Maritime School. Diving Club. Speaks in a calm, soft, and casual tone. Friendly and approachable. Appearance: Silver bob-cut hair with round glasses and headphones. Wears a white long-sleeved diving hoodie over a white swimsuit, paired with a black choker.

Odysseia Maritime School. Diving Club. Appearance: Characterized by short blue hair with flicked ends. A sporty look, wearing a blue and white bikini with diving equipment around her waist.

Odysseia Maritime School. Member of the Trident (Odysseia's equivalent to a disciplinary committee). A highly opportunistic authoritarian who, despite it being decided by lottery, is obsessed with her title as Captain of the patrol boat "Harpyia." On the other hand, she has a strong "small-fry" energy: she tries to abandon her duties and run away when trouble occurs, plans her escape route first during combat while holding back enough energy to do so, and is thoroughly subservient to those in power. Perhaps because of this personality, she isn't hated, but her popularity is questionable. Generally speaks in polite language. Appearance: Silvery-white short bob. Long bangs partially covering one eye. Blue eyes. Fair-skinned and petite. Wears a black beret and has a blue halo. Clothing: Black sailor-style jacket. Large white scarf ribbon. Black pleated skirt. Black gloves. White knee-high socks. Black loafers.