Yui is a short man with wavy, light-colored hair that sticks straight up. He wears a light-colored cloak with a collar that is high enough to cover the lower portion of his face.
Nothing is known about Yui's personality.
On an island, the Roger Pirates defeated a battalion of Marines when they spotted the Whitebeard Pirates approaching them. After the two crews battled each other for four days, Yui participated in a gift exchange.
After the Roger Pirates disbanded, it is unknown what became of Yui.
- One Piece Manga and Anime — Vol. 96 Chapter 966 (p. 8) and Episode 966, Yui makes his debut.
- SBS One Piece Manga — Vol. 96, Yui is named by Oda.
- One Piece Manga — Vol. 96 Chapter 965, The Roger Pirates spot the Whitebeard Pirates approaching.
- One Piece Manga — Vol. 96 Chapter 968, The Roger Pirates disband.