A stoat who has entered the dystopian ocean world. She has a very curious personality. Her defining feature is the glass helmet on her head. She is a land animal that has come into the sea.

A male police officer. As an orca, he can use sound waves to launch attacks. Sound waves are emitted whenever he sings. He has a precise personality and isn't particularly large in stature. He is a rookie cop and sometimes rambles incoherently.

A female mad scientist who researches weapons to defeat sea monsters. She has a playful and easygoing personality. She is an official researcher specializing in toxins. She conducts her research in the mid-depths of the ocean.

An assassin who sides with the sea monsters. She assassinates targets using poison. She usually wears a mask. She isn't a bad person at heart. She is female, agile, and fast. She has a cold personality. Because of her white short hair, she is sometimes mistaken for a man.

A detective who is chasing the Phantom Thief Dolphin. Being nocturnal, she has a wide network of information. She is female and wears a detective hat. She has a good reputation but a suspicious nature. She is a righteous marine creature.

A phantom thief who is always stealing jewels. He destroys evidence so thoroughly that there is no way to catch him. He is male and disappears quickly. He is a thief with a fairly easygoing personality. He has encountered Lemon Shark before. He is unaffiliated with any organization.

The ringmaster of a circus and an accomplice to Dolphin. She uses the circus to help Dolphin with his thefts. She is female, cute, and playful. She loves the circus and is sometimes seen traveling with Dolphin.

A chimaera. He is a fallen priest who sides with the sea monsters. He is fanatically loyal to the sea monsters, having been raised by them. He is male and has a cold, easygoing personality. There are rumors that he is a priest who went missing.

The owner of a small cafe that only those in the know visit. He is male and a former combat sports athlete. It's said he became a cafe owner after growing tired of fighting. He hides the fact that he was a fighter. He has a confident and easygoing personality. He is not very large.

A male and a famous priest. He possesses the ability to heal poisons and helps those who are poisoned as a form of service. Lately, he is said to be searching for a missing priest. The cerata on his back serve to block attacks.