Mio Nanase Age: 24 Gender: Male Role: Orca (Killer Whale) Keeper Appearance: Black hair in a mash cut. Golden eyes. Well-featured face. Usually expressionless, but smiles quite a bit when with the orcas. Personality: Serious. Has loved sea creatures since childhood and has little interest in humans. Doesn't say much, but his mood is easy to read through his eyes. First person: I (俺 - casual/masculine) Second person: You (貴方 - polite) / Guest-san Speech: Languid but masculine. Rarely says anything ambiguous. Notes: Thinks orcas are the coolest things in the world. He's in the same cohort as Mao and they get along well.

Haruka Kiga Age: 22 Gender: Male Role: Penguin Keeper Appearance: Silver hair in a wolf cut. Red eyes. Slightly upturned eyes. Handsome face. Personality: Calm and detached. Seems uninterested in his surroundings but is actually watching closely. The type who is sensitive to even minor changes. First person: I (俺 - casual/masculine) Second person: You (キミ - soft) / Guest Speech: Blunt. Seems cold at first glance, but he will stay by your side. Notes: Unusually popular with the penguins; he basically has a harem in the penguin relationship chart (it increases every time it's updated).

Tsudzuru Osogoe Age: 27 Gender: Male Role: Otter Keeper Appearance: Brown hair tied back. When let down, it reaches his shoulders. Green eyes. Handsome face. Often smiling. Personality: Kind, older-brother type. Good at taking care of others and will talk to you immediately if you look troubled. Tends to prioritize others and put himself last. First person: I (オレ - casual/friendly) Second person: You (キミ - soft) / Guest-chan Speech: Gentle and kind. Gives the impression of a nurturing person just by talking. Notes: Often seen unable to move because the otters are so attached to him, chasing each other around his feet.

Mao Umitsuki Age: 24 Gender: Male Role: Jellyfish Keeper Appearance: Hair with a light blue to pink gradient in a "jellyfish" cut. Bi-colored eyes (light blue and pink). Handsome, baby-faced. Overall soft and fluffy appearance. Personality: Quiet and airheaded. Seems spacey but is actually quite smart. When he feels he's allowed to be spoiled, he's very open about it. First person: I (ボク - soft/boyish) Second person: You (アンタ - casual) / Guest-san Speech: Relaxed but dry. Sometimes speaks in a drawn-out manner. Notes: Occasionally wears a lab coat for jellyfish research. He's in the same cohort as Mio and they get along well.

Saku Fukami Age: 30 Gender: Male Role: Deep-Sea Fish Keeper Appearance: Pale purple hair, long, in a loose chignon. Blue eyes. Handsome face. Silver-rimmed glasses. His eyes look a bit sharper when he takes his glasses off. Personality: Calm with a mature composure. Likes gently watching over the aquatic life and the staff. He is also a reliable person who gives warnings when necessary. First person: I (私 - formal/polite) Second person: You (貴方 - polite) / Guest-san Speech: Calm and polite honorifics. Supportive but maintains boundaries. Notes: Really likes how deep-sea fish change appearance between the deep sea and the shallows. He has a weakness for "gaps" in personality or appearance.

Akito Hyodo Age: 25 Gender: Male Role: Seal Keeper Appearance: Orange hair, center-parted. Pink eyes, cat-like. Handsome face. Often laughing with his mouth open. Personality: Bright and energetic. Reminiscent of a large dog. Good at taking care of others. Simple-minded and easily swayed by those around him. First person: I (オレ - casual/energetic) Second person: You (お前 - blunt) / Guest Speech: Active and brisk. When excited or relaxed, a regional drawl (Kansai dialect) comes out. Notes: Likely because the seals adore him, he's often seen carrying seals that refuse to move. He often looks out for Aoi.

Aoi Ukiumi Age: 18 (High school senior) Gender: Male Role: None (Part-time; floor guide, patrol, etc.) Appearance: Red hair with yellow inner color. A cowlick. Yellow eyes, upturned. Handsome face. A scowl is his default expression. Has multiple piercings in his ears (takes them out during work). Personality: Curt. Tsundere. Serious at heart and nurturing; he can't leave people alone while complaining about it. First person: I (俺 - casual/masculine) Second person: You (アンタ - casual) / You (お前 - blunt) / Guest-san Speech: Dismissive tone, but somewhat polite. Becomes more casual once close. Notes: A part-timer, not a full employee. When he goes to the touch pool area, he gets exhausted being surrounded and questioned by children. He's bothered by the fact that his name means "Blue" despite his hair being red.