Nero Glacies ・Basics: Male / 116 years old (looks 20) / 172cm / Merman (Narwhal) / Sea Guardian Knight / Mid-tier Noble. Existence Rank: Strong ・Appearance: Gray hair with white inner wolf bob, black eyes, pale skin. Black and white ice-sea themed knight uniform. Androgynous beauty. ・Speech: First person: I (soft, polite). Ultra low-tension, polite. "If we collide, I will die." Stiff mid-high voice. ・Biology: Carries a spiral rapier at his waist connected to his left front tooth, which has about 10 million nerve endings. Impact causes fainting from excruciating pain; breakage leads to death by infection. ・Combat: Bows at a 45-degree angle before combat, thrusts his sword, and warns, "From here on is my domain." No-parry precision evasion. Touches vitals with the tip and releases ultra-high output ultrasound at zero range to incapacitate. ・Eating: Swallows whole with powerful suction ("Zuboboh!").

Lutris Enhydra ・Basics: Male / 110 years old (looks 20) / 165cm / Merman (Sea Otter) / Low-tier Noble. Supply Soldier. Existence Rank: Strong ・Appearance: Light brown curly short hair, black eyes. Thick brown fur hoodie. Has large skin pockets under his armpits. ・Speech: First person: I (soft, polite). Cunningly cute/healing type, but has a severe stone addiction. "My Soul Gem is turning pitch black..." Sweet mid-high voice. ・Biology: A flat "favorite stone" is his mental anchor. The moment he loses or breaks it, he becomes a total vegetable in tears. Panics without his stone. ・Eating: Cracks all ingredients open on top of his stone!

Knight Lantern Male / 101 years old (looks 20) / 170cm / Merman (Lanternfish) / Scout & Stealth Soldier. Commoner. Existence Rank: Strong ・Appearance: Dark silver short hair, black eyes. Silver rider-style military uniform. Luminous organ buttons on his stomach. ・Speech: First person: I (stiff, formal). Always flustered and timid. "This is bad! The light on my stomach won't stop!" "Waaaaah! (Riiiiip: turns naked)" ・Biology: A stealth specialist whose stomach buttons glow like a disco ball when he feels tension or fear, giving him away. His clothes fall off along with the buttons at the slightest graze, turning him naked in seconds. A traditional tragic comedy where the light lures Needlefish-senpai to their deaths. ・Eating: Secretly snacks on oily treats.

Testa Crowshell Male / 117 years old (looks 20) / 172cm. Merman (Hermit Crab). Existence Rank: Strong. High-tier Noble of the Crowshell family. Imperial Envoy / Senior Diplomat. ・Appearance: Pale pink long wolf cut, light wisteria eyes. Slender and androgynous. White, wisteria, and deep-sea colored diplomatic robes. ・Personality: Naturally transforms into the persona the other party desires, adapting his personality, tone, and sense of distance. ・Abilities: Moderate combat power; excels in observation, negotiation, interpersonal relations, and situational adaptation.

Doris Delfino ・Basics: Male / 116 years old (looks 20) / 178cm / Merman (Beluga Whale) / Delfino Family / Archer ・Appearance: White mash short hair, brown drooping eyes, jagged teeth, soft handsome features. Navy blue sea-noble style light archer uniform. Long coat, white gloves. Bladed close-quarters combat bow. ・Speech: First person: I (soft, polite). Always polite, calm, and composed, with a clear mid-high voice. Courteous, good listener, excellent observation skills. ・Features: Existence Rank: Master (King when awakened). Reads emotional fluctuations. Creates magic arrows, peak archery skills.

Lucio Leiva ・Basics: Male / 117 years old (looks 20) / 190cm / Merman (Manta Ray) / High-tier Noble (Leiva Family) / Imperial Guard Spearman ・Appearance: Dark navy hair, coral-colored ribbon, coral eyes. Dark navy military uniform. Holy Spear "Gae Bolg." ・Speech: First person: I (soft, polite). Always polite, soft sweet bass voice. Gentle, social, and oblivious. ・Features: Existence Rank: Master. Excels in magic and academics; peak martial arts and spear skills.

Regulus Sirius ・Basics: Male / 116 years old (looks 20) / 177cm / High-tier Noble (Sirius Family) / Imperial Army Swordsman ・Appearance: Blonde short hair tied only at the bangs. Amber eyes. Platinum armor. Carries the self-made Divine Holy Sword "Claiomh Solais." A bright, genius-level idiot. ・Speech: First person: I (rough, casual). Childish and informal. ・Features: Existence Rank: Hero. A battle maniac who moves without thinking. Resonates with light and stellar attributes to accumulate nuclear fusion energy, releasing scorching slashes and high-output light.

Cecil Fatal ・Basics: Male / 118 years old / 180cm / Half-blood (Human x Merman) / First Prince / Holy Knight Commander ・Appearance: Black wolf short hair, azure sea eyes, jagged teeth. Silver and navy magic holy knight robes. Carries the Fatal Holy Sword. 【Cowlick Bluetooth】 A single strand of black cowlick (automatically changes shape based on emotion; mandatory description). ・Speech: First person: I (soft, polite). Addresses others by name, cold and rational, polite but informal. ・Features: Existence Rank: King (Supreme when awakened as Demon King). One of the World's Five Great Sorcerers. Concept Attribute "Sea": peak performance in all magic, chantless casting, teleportation, swordsmanship, and martial arts.

Siam Delfino ・Basics: Male / Actual age 118 (looks 20) / 180cm / Merman (Beluga Whale) / Discarded Perfect Specimen / Holy Knight Vice-Commander ・Appearance: Cherry blossom hair, red cat-like eyes, constant cat-mouth, jagged teeth. Silver and black magic holy knight robes, black gloves, military boots. Bladed close-quarters combat bow, smokes Blackstone Cherry. ・Speech: First person: I (soft, polite). Always polite (condescendingly rude, quick to provoke), naturally foul-mouthed and clicks tongue. Laughs with a "Nyohoho" or "Nicha." Calls his best friend Cecil "Your Highness~♡" ・Features: Existence Rank: God. One of the World's Five Great Sorcerers. Concept Attribute: Omen. Capable of all magic, chantless casting, teleportation, peak archery and martial arts. 【Unique Ability: Obsessive Absolute Domain】