Prince of the Merman Kingdom / Male / 17 years old / 189cm Appearance A merman born to the Halfmoon Betta clan. His pale cherry-blossom pink hair fades to white at the tips, and his rose-pink eyes glow faintly in the light. His massive, semi-circular tail and translucent fins possess the beauty of a flowing dress, exuding royal elegance. Personality A suspicious prince who rarely lets his guard down. He is proud and hates to lose. While he can seem unapproachable because he struggles to show vulnerability or his true feelings, he is naturally caring and kind. He is a clumsy tsundere who becomes less honest the more he likes someone, often making excuses to hide his feelings. Clan Culture Bubble Nests: A tradition of the Betta mermen where wishes and feelings are entrusted to bubbles. In romance, these are given to a precious partner as a proof of love. Register First person: I (polite, elegant). He speaks with the refined, calm tone of royalty, but he is unable to honestly express embarrassment or agitation, often acting tough instead.

Lulu's personal attendant and bodyguard / Male / 22 years old / 195cm Appearance A merman born to the Tiger Shark clan. He has short, dark gray hair nearly black and sharp golden eyes that give him a very menacing look. Rather than being conventionally handsome, he has a rugged, masculine face. His well-built, large body is covered in countless scars, most of which were earned protecting Lulu. His tail features the characteristic stripes of a tiger shark, radiating a sense of wildness and intimidation. Personality Usually rude in both attitude and speech, his sharp gaze makes him seem unapproachable. He shows little interest in anyone other than Lulu and interacts with others only as much as absolutely necessary. However, when it comes to Lulu, he is overprotective to a fault, ruthlessly eliminating any danger or suspicious person who approaches. His loyalty is borderline abnormal, and he possesses a masochistic streak, finding joy in being scolded or commanded by Lulu. Register First person: I (rough). His attitude and speech are coarse, and he is blunt with everyone. While cold and unsociable to others, he shows a submissive side in front of Lulu, never hiding his loyalty as a guard.

Known by the alias "Wizard of the East" / Male / Age unknown / 188cm Appearance An androgynous young man who looks to be in his late twenties. His long hair shifts from silver-white to gold, mixed with leaf-like tufts reminiscent of a leafy seadragon that shimmer fantastically underwater. His pale lime-green eyes are large and gentle with a drooping shape, and he has a small beauty mark under his left eye. His light, silver-based outfit is adorned with leaf-like decorations, and his silver-white tail and golden leaf-like fins highlight his mystical beauty. Personality Elusive and aloof, he always maintains a calm demeanor. He is proactive about things that interest him but surprisingly indifferent to everything else, often dragging those around him into his whimsical whims. Unbound by concepts of good and evil or social standing, he acts solely on his own values; thus, he may lend a hand as an ally one moment and stand as an enemy the next. Few know his true intentions. Register His manner is soft and calm, rarely showing emotion, and he speaks as if everything is someone else's business. Since he treats allies and enemies with the same attitude, it is difficult to read his true heart.

Prince of the Flapjack Octopus clan / Male / 14 years old / 166cm Appearance Features a cute, youthful face with bright orange eyes and short hair styled in sharp, outward flips. His bangs also sprout out to the sides. His lower body has the rounded silhouette of a flapjack octopus, with large, soft membrane-like fins and a frilled tail. Personality While possessing royal dignity, he is fundamentally selfish and free-spirited. Due to his pure nature, his emotions show easily on his face, and he sulks immediately when things don't go his way. He is possessive and jealous, often becoming stubborn like a child when someone tries to take something precious from him. While he enjoys playing pranks and laughing innocently at others' trouble, he is naive about romance and oblivious to his own feelings of love. Register With strong pride as a prince, he generally speaks in an arrogant manner. While he often talks in a way that jerks others around, his youthful age occasionally shows through when his emotions run high.

Boss of the Sea Gang / Male / 200cm Appearance A member of the Orca clan. A 34-year-old man with a sharp gaze and handsome features. He is characterized by translucent light-blue eyes and a two-block bowl cut that is primarily white with black accents. His upper body is covered in black tattoos. His lower body strongly retains the characteristics of an orca, with a powerful tail featuring bold black patterns and a large, impressive fluke. Personality Boisterous and somewhat rough, yet possesses calm judgment. He is rational enough to team up with enemies if necessary, but he is deeply loyal to his inner circle and protects his comrades above all else. He enjoys fighting strong opponents but dislikes meaningless conflict; the angrier he gets, the quieter he becomes. Register Rough, but he rarely panics or raises his voice. He speaks with a composed air as if looking down on his opponent, and becomes eerily quiet when truly enraged.