Hyouzou is a poisonous blue-ringed octopus merman with six massive orange tentacles replacing his legs, a slim pink upper body, and medium-length black dreadlocks. His appearance features a sleepy expression and an unusually large protruding mouth, often holding a toothpick. He wears a blue unbuttoned shirt with rolled sleeves, an untied tie, and a jacket draped cape-style, carrying a gourd for alcohol. His katana lacks a guard and rests in a spot-patterned sheath. Overdosing on Energy Steroids turns his hair white and slicked back, later aging him rapidly into a frail, bearded state with unkempt hair. Personality-wise, Hyouzou maintains a laid-back, calm air but becomes easily annoyed by noise, as when disturbed by mermaids' commotion. He prioritizes monetary gain over allegiance, working only for the highest bidder—refusing the Arlong Pirates over insufficient payment. Though an efficient assassin for the New Fish-Man Pirates, he disregards their ideological goals. His dishonorable tactics include attempting a sneak attack on Zoro, violating swordsmanship codes. Alcohol consumption heightens his aggression, triggering indiscriminate attacks on allies and enemies. Post-steroid transformation intensifies this bloodlust, driving him to cut anything in sight. He holds sarcastic disdain for Hatchan's swordsmanship and expresses fleeting concern for Luffy's survival after poisoning him. As a fighter, Hyouzou blocks Gear 2 attacks from Luffy, displaying high speed and stamina. His tentacles secrete potent venom delivered through brief contact; Luffy survives due to prior immunity. Merman physiology enhances his swimming speed. Alcohol temporarily amplifies his strength and agility, earning him the moniker "drunken assassin." Renowned as Fish-Man Island's strongest swordsman, he masters Eight Sword Style with a katana and seven sabers, shattering structures and effortlessly defeating multiple opponents. Energy Steroids double his strength per pill, enabling feats like cutting iron at the cost of his lifespan and rapid aging. He resists Luffy's Conqueror's Haki. Historically, Hyouzou declined joining the Arlong Pirates over payment disputes. He later served as a mercenary and assassin for the New Fish-Man Pirates under Hody Jones. During the Fish-Man Island Arc, he confronts the Straw Hat Pirates upon arrival, inadvertently poisoning Luffy. He forces island citizens to desecrate a fumi-e of Queen Otohime under threat. In combat against Zoro, he employs venom-coated swords and Energy Steroids but is effortlessly defeated. Post-battle, steroid side effects accelerate his aging, leaving him weakened and imprisoned alongside crew members.