Sai

Sai (サイ) is a member of the Chinjao Family, along with Chinjao and Boo. He is also a martial artist who joined as a gladiator at the Corrida Colosseum to compete for the Mera Mera no Mi.

Appearance
Sai is a thick built man with shaggy dark hair and sideburns. Despite being built, he does not have defined abs, nor does he have a belly button.

He sports a dark cape with a light-colored frill collar. He wears puffy thick-striped pants and dark shoes. He has the number "13" tattooed on his left side just below his ribs.

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 belligerent 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 using this weapon. With Boo, he was able to hold back his enraged grandfather, however it is possible that Chinjao went easy on them since they are his grandchildren.

Dressrosa Arc
Sai, Boo, and Chinjao came from the country of flowers to compete for the Mera Mera no Mi. For the battle royale, he was placed in Block C.

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. After Luffy thanked them, Sai first repeatedly said that his thanks wasn't needed. He then suddenly turned aggressive and get held back by Boo.

Later, when Chinjao was attempting to kill Luffy because of his vendetta on Garp, Sai and Boo held him back before his anger went out of control. Sai and Boo then explain to him that he can just kill Luffy during C block and remind him of their true goal.

Trivia

 * Sai is the third character to give someone the middle finger in the manga, the others being Trafalgar Law and Sanji.
 * His participant number in the Corrida Colosseum is No. 0309