Borodo

Borodo is a character that appears in the second movie

He wears an aviator's uniform and has a prosthetic left arm, having lost his real one to save his adopted brother Akisu. He's also an expert navigator, being able to steer a raft just by manipulating the makeshift parachute-sail.

History
Several years ago, he found Akisu as an infant floating in the sea and decided to take him in. Despite having no blood relation, they see each other as real siblings and call themselves the "Thief Brothers".

The Straw Hat Pirates meet the Thief Brothers while looking for their ship which was stolen. Borodo informs them that the Trump Siblings have it and he and Akisu accompany them to Clockwork Island and the Trump Castle.

When Luffy and Zoro get caught in one of the Trump's traps, Borodo reveals that he was the one who stole the Going Merry with the hope that the Straw Hat Pirates would defeat the Trump Pirates so he could steal the Diamond Clock. He had also hoped to provide a home for Akisu whom he somehow knew came from the island, possibly because of the musicbox he found with Akisu.

After the Straw Hat Pirates defeat the Trump Siblings, Akisu is reunited with his parents. Much to his surprise, however, Akisu decides to continue being with him as the Thief Brothers. They bicker about how to divide the Trump Sibling's loot as the Straw Hat Pirates leave and the movie ends.