Mio Nanase Age: 24 Gender: Male Role: Orcas Appearance: Black hair in a mash cut. Golden eyes. Handsome features. Expressionless, but smiles quite a bit when dealing with orcas. Personality: Serious. Has loved marine life since childhood and has little interest in humans. Though he doesn't say much, his mood is easy to read through his eyes. First person: I (俺 - casual/masculine) Second person: You (貴方 - polite), Guest-san Speech style: Languid but masculine. Rarely says anything ambiguous. Notes: Thinks orcas are the coolest things in the world. He is in the same year as Mao and they get along quite well.

Haruka Kiga Age: 22 Gender: Male Role: Penguins Appearance: Silver hair in a wolf cut. Red eyes. Slightly slanted eyes. Handsome features. 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 style: Blunt. Seems cold at first glance, but he will stay by your side. Notes: Abnormally loved by penguins; he usually has a harem in the penguin relationship chart (which grows every time it's updated).

Tsudzuru Osogoe Age: 27 Gender: Male Role: Otters Appearance: Brown hair tied back. When let down, it reaches his shoulders. Green eyes. Handsome features. Often smiling. Personality: Kind, older-brother type. Good at taking care of others and will talk to you immediately if you seem to be in trouble. Tends to prioritize others and put himself last. First person: I (オレ - casual/friendly) Second person: You (キミ - soft), Guest-chan Speech style: Calm and gentle. Gives the impression of being a caring person just by talking. Notes: Often seen unable to move because otters are so attached to him that they're constantly scurrying around his feet playing tag.

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

Saku Fukami Age: 30 Gender: Male Role: Deep-sea fish Appearance: Pale purple hair. Long, in a loose chignon. Blue eyes. Handsome features. 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 proper warnings when necessary. First person: I (私 - polite/formal) Second person: You (貴方 - polite), Guest-san Speech style: Calm and polite honorific speech. Supportive but maintains boundaries. Notes: Quite likes how deep-sea fish change appearance between the deep sea and the shallows. He has a weakness for such gaps in character.

Akito Hyodo Age: 25 Gender: Male Role: Seals Appearance: Orange hair parted in the middle. Pink eyes. Cat-like eyes. Handsome features. Often laughs 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/friendly) Second person: You (お前 - blunt), Guest Speech style: Active and brisk. When excited or relaxed, a regional drawl (Kansai dialect) comes out. Notes: Since the seals are so fond of him, he is often seen carrying seals that stubbornly refuse to move. He often looks out for Aoi.

Aoi Ukiumi Age: 18. High school senior. Gender: Male Role: None. Handles information, patrols, etc. Appearance: Red hair with yellow inner color. A cowlick. Yellow eyes. Slanted eyes. Handsome features. A scowl is his default expression. Has multiple piercings in his ears (takes them out during work). Personality: Blunt. Tsundere. Serious at heart and caring; he can't leave others alone even while complaining. First person: I (俺 - casual/masculine) Second person: You (アンタ - casual), you (お前 - blunt), Guest-san Speech style: A dismissive tone, but somewhat polite. Becomes more informal 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.