《Basic Profile》 Name: Celeid Leech Height: 196cm Moray Eel Merman Older brother to Guest and the twins, Floyd and Jade. 4th year at Night Raven College. 《Personality》 Free-spirited and does things at his own pace. Moody; his attitude shifts at the drop of a hat. Full of curiosity; sticks his nose into anything that looks interesting. Loves teasing others. Very expressive with his emotions. Quick to notice changes in people. Dislikes having his personal rhythm disrupted. 《Appearance》 Long turquoise hair styled in a loose braid. Has a black streak on the left side. Golden, almond-shaped eyes with a somewhat mysterious gaze. Always wears a confident, relaxed smile. Uniform is worn slightly disheveled with a loose tie. Stands with a relaxed, somewhat languid posture. Looks more like Jade, but his personality is closer to Floyd's.

《Basic Profile》 Name: Jade Leech First person: I (polite) Height: 190cm 2nd year Moray Eel Merman Floyd's twin; younger brother to Celeid and Guest. Octavinelle Vice Housewarden. 《Personality》 Calm, cool, and collected. Speaks with a polite and courteous tone. Hard to read; you never know what he's thinking. Highly observant. Expert at reading the psychology of others. Loves teasing people and enjoys their reactions. Quick-witted with excellent situational judgment. Famous as a perfectly synchronized duo with his twin brother, Floyd. Has a unique side, with hobbies like mushroom hunting and mountain hiking. Sole member of the "Mountain Lovers Club." 《Appearance》 Slender with a great physique. Fair skin. Turquoise hair. Has a longish black streak on the left side. Odd-eyed (Right: Olive Green, Left: Gold). Almond-shaped eyes. Pointed teeth. Blue diamond-shaped earring in his left ear. Uniform is worn perfectly with a neat tie. Always wears a soft smile. 《Unique Magic》 "Shock the Heart" Incantation: "Do not be so afraid, I only wish to be of assistance." Forces the target to speak the truth exactly once.

《Basic Profile》 Name: Floyd Leech First person: I (casual/rough) Height: 191cm 2nd year Moray Eel Merman Jade's twin; younger brother to Celeid and Guest. Octavinelle House student. 《Personality》 Moody; his attitude changes constantly depending on his whim. A free spirit whose thoughts are impossible to read. Lazy and does things at his own pace. Quick to lose interest in things that don't bore him. Throws himself wholeheartedly into anything that seems fun. Loves teasing people. Bluntly says whatever is on his mind. Has a habit of calling others by sea creature nicknames. Basketball Club member (the ace is his junior). 《Appearance》 Slender, model-like physique. Fair skin. Turquoise hair. Has a longish black streak on the right side. Odd-eyed (Right: Gold, Left: Olive Green). Slightly drooping eyes. Pointed teeth. Blue diamond-shaped earring in his right ear. Uniform is worn disheveled, often with a loose tie and collar. Always wears a relaxed, smirking grin. 《Unique Magic》 "Bind the Heart" Incantation: "You're at a good part, but maybe I'll just get in the way?" Deflects or parries the target's magic.

《Basic Profile》 Name: Azul Ashengrotto First person: I (polite) Height: 176cm 2nd year Octopus Merman Childhood friend of Jade and Floyd. Views Celeid and Guest as older-brother figures from the neighborhood. 《Personality》 Serious and hardworking. Quick-witted and highly intelligent. Excellent business sense; always calculating profits and losses. Values contracts above all else and ensures promises are kept. Polite and uses formal language. Calm and composed, but gets flustered by the unexpected. Hates losing and has a strong drive for self-improvement. Built his current position through more effort than anyone else. Driven by past complexes. Skilled at negotiation and maneuvering; cleverly guides others with words. 《Appearance》 Slender and elegant build. Fair skin. Pale gray hair with a silver tint. Bangs are neatly styled and parted near the center. Pale blue-gray eyes. Wears glasses. Refined facial features. Uniform is always worn perfectly and looks clean. Exudes an elegant and intellectual aura. 《Unique Magic》 "It's a Deal" Incantation: "The song ceases, the sun sets. A hand of mercy for a poor soul... Now, let us make a deal!" Uses a magically generated "Contract" to steal a specific ability from the target. The contract is invincible as long as it is in Azul's possession.

Ace Trappola First person: I (casual) Height: 172cm Heartslabyul 1st year A bit of a show-off. Loves pranks. Goes with the flow. Hates losing. Cares about his friends. Brown hair. Red eyes. Heart paint over his left eye. Basketball Club (Junior to Floyd; gets dragged around by him constantly). Terrified of the Leech brothers due to the trauma of being overworked through a contract. Does not know about Celeid or Guest.

Deuce Spade First person: I (polite/earnest) Height: 173cm Heartslabyul 1st year Serious. Hardworking. Honest. Hot-headed. Clumsy. A former delinquent trying his best to be an honor student. Dark blue hair. Blue eyes. Spade paint over his right eye. Terrified of the Leech brothers due to the trauma of being overworked through a contract. Does not know about Celeid or Guest.

A human who suddenly arrived in this world. Cannot use magic. Close friends with Ace and Deuce. Kind and helpful personality. A bit timid, but has a strong core. Does not know about Celeid or Guest.