A light brown sea lion, male. He is clumsy, but his confidence pierces the sky! A magic school freshman full of positive energy, his dream is to become a great archmage who protects the sea. He is a brave leader who leads his friends with his flying cloak fluttering, though he often causes trouble with his eccentric behavior. However, his love and passion for the sea are hotter than anyone else's! Our protagonist, Gangchi, runs toward the path of an archmage, shouting, "A cooler tomorrow than today!"

A pink sea lion, female. A sea lion who hates to lose! But there is one thing she can never overcome... singing! Everyone who hears Eumchi sing is on the verge of fainting?! However, the moment she held the Whale's Song card like fate, a special ability to manipulate sound awakened! Because of her princess-like appearance, you might think she only likes pretty things, but she actually has a very easygoing personality! Above all, she is a sea lion with a warm heart who treasures her friends more than anything in the world.

A blue sea lion wearing glasses, male. Ichi is so knowledgeable that he is called a living library! He is smart enough to answer any question, but because he tries to learn even magic only through books, he rarely shows his true power in practice. Because of that, he sometimes loses confidence, but there is no giving up for Ichi! With the support of his friends, he moves forward step by step, gradually regaining his confidence and growing as a wizard.

A purple sea lion, female. A fragile girl...? No way! Mangchi is a wizard of powerful strength! She usually has a soft smile, but in dangerous moments, she is the guardian of the sea lions who steps forward before anyone else to suppress powerful enemies in an instant! However, contrary to her appearance, she is a sentimental soul who loves pretty things, making dolls out of seashells and showing off dance skills that rival girl groups whenever she dances.

A mint-colored sea lion, male. A mysterious being whose inner thoughts are unknown. It's impossible to tell what he's thinking, but one thing is for sure! He believes he is the most handsome in the world! He is a narcissistic character who pulls out a mirror to fix his hair anytime, anywhere, but behind that perfect smile lies a secret that no one knows. A haughty but somehow lonely, mysterious sea lion of the magic school.

An spindle tree, male. He uses a wheelchair. A gentle leader who always emphasizes to students that character and manners are more important than magic skills. He is the owner of a warm heart who embraces the children's mischief with a "Ho-ho-ho" laugh. He teaches the core values of the magic school—coexistence and cooperation—and leads the school as a mysterious guardian who protects the peace of the sea. And secretly, he keeps the secret of protecting the 'Mystic Stone' hidden deep within the magic school.

A mint-colored dolphin, male. He is a master of teleportation magic and the teacher in charge of geography class. He teaches that you can obtain magic cards by helping the creatures of Dokdo and connecting with their hearts. He is a teacher with a bright and warm heart who tries to raise the mischievous sea lions into great archmages through praise and encouragement rather than scolding.

A lionfish, female. She is the homeroom teacher for the magic school freshmen and the teacher in charge of magic class. She often shouts, "Ugh! My blood pressure...!" because of the students' mischief and accidents. She teaches that one must always have a sense of responsibility when using magic and tries to strictly maintain the school's rules and order. On the other hand, she has an unexpected side, as she admires the legendary wizard Sharkman.

A purple squid, male. He is a strict teacher who teaches manners and character to the mischievous Gangchi and his friends. He has a firm conviction to restore the once blue and clear waters of Ulleungdo, and he is deeply worried that the sea is becoming sick due to uninvited guests from tropical waters recently. He is also a doctor who treats sea creatures. He mainly operates at the underwater etiquette school.

A bulgyhead wrasse, female. She is a teacher who teaches the underwater ecosystem of Dokdo. She usually shows a gentle appearance, speaking slowly and leisurely, but if someone threatens a sea creature, her anger explodes, her hump grows larger, and she exerts terrifying power. She is a scary teacher who warns students never to make her angry. She mainly operates in the sea.