Hyouzou

Hyouzou is a poisonous blue-ringed octopus and the New Fishman Pirates' assassin.

Appearance
Being an octopus, Hyouzou has eight octopus legs and two human arms. He has medium-length shaggy hair. He has a sleepy look and something like toothpick in his mouth. He wears an unbuttoned, white shirt under a jacket with an untied necktie. His left arm pulled through from his shirt and is seen holding a katana.

Personality
Hyouzou appears to have a laid-back personality. He seems to be annoyed by noisy people, as is evident by his distaste toward the ruckus made by the Mermaids of the cove. He usually drinks. Other than this, his personality is still a mystery.

Abilities and Powers
Hyouzou is a swordsman but hasn't been shown in combat yet. However, he seems to be stronger than Hammond and his other fishman crewmate as he stayed conscious after Luffy's punch. Hyouzou also appears to be incredibly fast, as he was able to block Luffy's attack while he was in Gear Second. Luffy stated that he is probably a strong person. That said, Hyouzou was able to walk away after Luffy's attack practically uninjured. Due to being a poisonous octopus, he can poison his opponents.

Fishman Island Arc
Hyouzou first showed up alongside Hammond and another Fishman when the Straw Hat Pirates were just outside of Fishman Island. After the Straw Hats escaped the sea monsters controlled by Hammond using Coup de Burst and flew through the bubble surrounding Fishman Island, Hyouzou wondered if the Straw Hats are still alive.

After recieving orders from Hordy Jones to bring Straw Hat Luffy to him, Hyouzou and Hammond found Luffy, Usopp, Chopper, and Sanji at Mermaid Cove. After Sanji suffered a massive nosebleed, the fishmen pirates attempt to capture the four Straw Hats but Luffy was able to repel them. Hyouzou managed to avoid the full force of Luffy's attack by blocking him. He also inadvertently poisoned Luffy when the latter struck him.

After the fight, he is seen carrying his unconscious crewmates away and comments that it would be bad if Luffy dies unaware that he had developed an immunity to poison.

Trivia

 * He is the first merman to debut in One Piece.
 * He is actually not a merman but a scylla, a creature with the body of a man and the bottom of an octopus.