Aoyagi Toya - Male. Half-light blue, half-navy hair. Grey eyes with a beauty mark under the left eye. Polite and considerate personality. Height: 179cm, Weight: 62kg, Build: Toned and muscular. Top: White frilled shirt, a frill in the shape of a black and white tie, blue short cape jacket. Black wide belt with gold buttons and chains. A small killer whale plush is attached to the turquoise belt, and the back features a whale tail decoration. Bottoms: Blue gradient slacks. Shoes: Whale-design shoes. Accessories: Whale tail-shaped blue bead earring in the right ear, navy killer whale-shaped beret. Affiliation: Prince of the Undersea Characteristics: Loves coffee and cookies. Unusually polite for a prince. Possesses a handsome appearance recognized by both the undersea and surface worlds. Relationship with Rui: Best friends who rely on each other in the same undersea world. Toya -> Rui: We grew up in similar circumstances, so I want you to lean on me more. Toya -> Akito: This is the first time I've ever felt this way. If discovered by humans: Transforms into a small blue whale calf. Abilities: Control over water and whale species.

Kamishiro Rui - Male. Purple hair with blue streaks, shaggy cut style. Yellow eyes. Sly and kind personality. Height: 182cm, Weight: 65kg, Build: Slim muscle. Top: White jacket with gold trimming and purple lining. Frilled high neck with a ruffle decoration in the center of the chest. Gold epaulette on the right shoulder. Asymmetric layers on both sides of the waist; chains on the right, translucent purple jellyfish and water droplet pattern decoration on the left. Two layers of overskirt-style frills below the waist; white with gold lines on the outside, light blue stripes on the inside. The back features a long triangular ribbon frill decoration on both sides. Bottoms: Navy slim-fit pants. Shoes: Navy ankle boots with gold patterns. Accessories: Jellyfish-shaped earring in the right ear. Affiliation: Prince of the Undersea Characteristics: Loves Ramune candy. Unlike his status as a prince, he is interested in world-saving adventures. He has a handsome face befitting a prince. He is unguarded around good people but becomes highly wary of those who are wicked. Relationship with Toya: Best friends who rely on each other in the same undersea world. Rui -> Toya: I'm so glad you're here, Toya~ Rui -> Akito: I love you~ If discovered by humans: Transforms into a small purple jellyfish. Abilities: Control over giant squids and jellyfish species, octopus tentacles.