Vinsmoke Yonji

Vinsmoke Yonji is a member of the Vinsmoke Family and Germa 66. He is Reiju's and Sanji's younger brother.

Whole Cake Island Arc
Yonji first encountered the Sanji retrieval team right after they entered Big Mom's waters. Luffy's group mistook him for Sanji until Yonji revealed otherwise. Seeing that the Thousand Sunny was not the ship Sanji was on, Yonji was about to leave. Chopper called out to him, still calling him Sanji, much to Yonji's annoyance. Chopper begged for an antidote to Luffy's poisoning, but Yonji taunted the group to try to take it by force. His sister, Reiju, appeared and kicked Yonji for his rudeness. After Reiju cured Luffy of his condition, Yonji and Reiju left the Sanji retrieval team alone without making a scene. They also decided to pretend that they never saw the Straw Hats to prevent Sanji's marriage from being called off.

Trivia

 * His name means four o'clock.