Yuki

Yuki: The mysterious little ranch girl who lives in a remote island in a ranch where the giants celebrates at. She was responsible for the duel between Dorry and Brogy. She appeared in a small flashback at the end of the Little Garden arc over 100 years ago in 1422 AOS. When Dorry and Borgy caught 2 two huge Sea Kings, she betted them to see which is bigger. This debt became a duel and the reason of their duel was forgotten. After that it's not known what happened to Yuki but since this event was 100 years ago, she may have died of old age.