Sai

Sai is a member of the Chinjao Family who, along with Chinjao and Boo, is a gladiator participating to win the Mera Mera no Mi at the Corrida Colosseum.

Appearance
Sai has shaggy black hair, and sideburns. He has long lower eyelashes, and sports a cape with frills at the neck. He wears puffy pants with black and white stripes, and black shoes. Sai has a tattoo of a "13" on the left side of his long abdomen, and his entry sticker on his right side.

Personality
He believes in honesty and fairness, as he stood up for Luffy when he was about to be disqualified. Whenever he rejects something, he repeatedly says there is no need for whatever it is, and then turns aggressive toward the person who offered it.

Abilities and Powers
Little is known about Sai's powers, but he is seen using a sword when attempting to make a lunge at Luffy. It is currently unknown how skilled he is with this weapon.

Dressrosa Arc
After Luffy defeated Spartan before the competition started, one of the colloseum staff was about to disqualify Luffy. Sai and the rest of the Chinjao Family stepped in and spoke on Luffy's behalf.

Trivia

 * Sai is the third character to give someone the middle finger in the manga, the others being Trafalgar Law and Sanji.