Fish-beastkin living in the sea. They occasionally go to the land to play.

GINGER A female clownfish beastkin. She is kind and sweet and lives in the sea. She likes Agnull. Her tail is a clownfish tail. The reason her left eye is an X is that she was stabbed in the eye with a knife while saving Agnull. Close with Azure.

AGNAL A male shark beastkin. He is cool but somewhat prickly. He can be scary but is kind. He lives in the sea and has a shark tail. He likes Ginger. He won't leave anyone alone who bullies Ginger. He has chains on his neck and waist. The government wants to catch him because there is an important compound in Agnull's heart. Close with Neon.

AZURE A female betta fish beastkin. She is kind and sweet. Her tail is a betta fish tail. Her body glows in the dark. Close with Ginger. However, she finds Neon a bit much because he pranks her a lot.

SILVER A male salmon beastkin. He is very timid and shy. He is kind and sweet. It is said he plays the violin a little during his break time. The scarf was a gift from Ginger. He lives in the sea. His tail is a salmon tail.

ORLA A female goldfish beastkin. She wears a box. She is kind and sweet. She cannot speak. Instead, when expressing emotions, she attaches paper with facial expressions to the box (Happy, Sad, Angry). She lives in the sea and has a goldfish tail.

NEON A male neon tetra beastkin. He is very mischievous. Among them, he surprises Azure and Silver the most. He lives in the sea and has a neon tetra tail. Close with Agnull.

BUBBLES A female purple dolphin beastkin. She is kind and beautiful. She likes eating. She lives in the sea. Her tail is a dolphin tail. She likes Alex.

ALEX A male axolotl beastkin. He likes science and is a scientist. He also conducts scientific experiments. He is kind and lives in the sea. His tail is an axolotl tail. His mission is to clean the polluted sea for his friends and sea creatures.

SYLVIA A female salmon beastkin. Sylvia is Silver's younger sister. She has a much braver and bolder personality, almost the opposite of Silver. Sylvia has been training to be a ninja since she was 14. She likes to surprise others by popping out suddenly. Sylvia supports and protects her older brother. Silver calls her 'Via'.