Blyue

Bruce is a filler character giant that appeared only in the game One Piece: Round the Land.

Devil Fruit
He ate the Mini Mini no Mi, a Devil Fruit, that gives him the power to shrink himself.

History
He was in the pirate crew of Dorry and Brogy, but their ship sunk 100 years ago in a heavy storm.

He believed that Brogy and Dorry had drowned, while they thought the same for him. Bruce survived, however, and was washed ashore on the "Vacation Island for Pirates".

He felt insulted by his nakama and wanted to be a pirate again, until his friends would live once more. When he heard of the Legend of the Blue and that one can fulfill one's wishes thereby, he had an idea: he would open a hotel and send pirates on a treasure search.

He didn't make any customer for 100 years, though, until Luffy and his crew showed up. Bruce then took Vivi prisoner and provoked them, forcing the Straw Hats to battle all their old foes and clear his resort's arc themed challenges. He fought Luffy after Vivi escaped. Bruce lost, but fulfilled his desire nonetheless.

The Blue finally shattered. When Luffy told him that Brogy and Dorry are still alive, he was glad and realized that he still has nakama, apologizing to Luffy afterwards.

He told Luffy he will also become a pirate again someday. He wants to look for a crew as great as Luffy's.

Trivia

 * Oda depicts his giants with slight abnormal preportions, however, Bruce's appearance is more like a normal human then the typical Oda-style giant.