The official Japanese website for One Piece has unveiled the character designs and further details about the Silver Mine arc. Erin has translated the descriptions of these characters, which are as follows:

Bill (ビル)





The leader of the Silver Pirates Union and the user of the “gutsu gutsu no mi.” In Japanese, gutsu gutsu is the sound of something boiling. He’s a “smelting man.”

Dezaia (デザイア)



A female pirate who wears a long coat reminiscent of a “yankee” or Japanese street thug. She has a “deep connection” to Bartolomeo.

Peseta (ペセタ)

A top member of the Silver Pirate Union who admires Bill.

Aberon (アベロン)



“Koro koro no mi” Devil Fruit user. Koro koro is the sound of something rolling, and living up to his name, Aberon is known as a rail car man. He chases after Luffy using his rolling attacks.

Tanaka



A member of the Tesoro Pirates who uses the “nuke nuke no mi” or “Fade Fade Fruit.”

A summary of the Silver Mine arc:

The Straw Hats, while continuing their adventure in the New World, head for Zou on the Going Luffy Senpai. Bartolomeo, overcome with admiration for Luffy, is moved by the chance to see him up close. One night, Luffy and Bartolomeo are captured by the female pirate, Desaia, and her battle boat army. They are a part of the “Silver Pirate Union”, a large organization whose headquartes is located on the deserted island of “Silver Mine.” Their leader is the smelting man, Bill — a user of the “gutsu gutsu no mi.” The Silver Pirate Union use his powers to create various weapons and are a powerful armed group! Can Luffy and Bartolomeo escape from the island and reuine with their comrades? What is past does Desaia have with Bartolomeo and what is their relationship? And what’s the connection between Bill, who can manipulate silver, and the Gold Emperor Gild Tesoro…?

As announced earlier, the Silver Mine arc will premiere on June 26, along with One Piece opening 19, 「ウィーキャン！」 “We Can!”. In addition, it has also been confirmed that the Silver Mine arc is in some way tied to One Piece Film: Gold, which is set to release in Japanese theaters on July 23.

SOURCE: One Piece official (Japanese), Natalie