Seto was a thin, muscular boy with shaggy black hair and tan skin. He wore a brown skirt made out of leaves, and a tan loincloth. He wore a white cap, with black upside down U shapes. He has white wings on his back, like other Shandia.
When he was older, he wore his hair in a pony tail, and he no longer wore his cap. He also had yellow bands around his upper arms.
Seto was a Shandia who desired to be like Calgara, whom he admired. When he caught the plague, he became distraught that he was going to die, never seeing his dream come true. He became one of the first Shandia to trust Noland, whom as a stranger cured his disease and earned his trust. He displayed noble traits by standing in front of the cages that held Noland's men when the villagers wanted to kill them, keeping their promise not to harm Noland's men until the time ran out. However, he was quick to shun Noland like any other Shandia once they discovered their sacred forest was cut down. When Mousse explained the misunderstanding, he lived hoping for the day Noland would return. Like Calgara, he displayed a strong desire to protect his village and cared heavily for its people.
Seto was affected by the plague that has ravaged the Shandia. However, Montblanc Noland managed to cure it in time. He knew from the start that Noland was a honest, wise and good man, and he defended Noland and his crew from the wrath of the Shandia. At some point after Noland's departure, he married Calgara's daughter Mousse.
Years later, he and Calgara entered the ruins to ring the bell. While Calgara went to ring the bell, Seto fed Nola (who had made itself at home in the ruins) an apple. Suddenly, there was an earthquake, and he and Calgara fled to the village. The Knock Up Stream had shot their island into the sky, and Seto found himself living his childhood dream to defend his people when the Skypieans came to take their land away from them.
- ↑ One Piece Blue Deep: Characters World (p. 97), Seto's birthday is given.
- ↑ One Piece Manga — Vol. 31 Chapter 287, Seto catches the plague
- ↑ One Piece Manga — Vol. 31 Chapter 289, Seto protects Noland's crew.
- ↑ One Piece Manga — Vol. 31 Chapter 292, Seto is revealed to have married Mousse.
- ↑ One Piece Manga — Vol. 31 Chapter 292, fate of the Shandia.