Amigo Pirates

The Amigo Pirates are a group of pirates that serve under Shiki. They ride in a submarine and the majority of them dress up as mariachis. They are lead by Largo and his vice-captain Colt. Their group is welcomed to become Shiki's 51st pirate division, but are given a condition first, which is to kidnap Boss, a giant beetle that was apparently stolen from Shiki, and is now living in Little East Blue.

Trivia

 * Their ship is the second in the series capable of changing into a submarine, the first being Wapol's ship. Coincidentally, the Captain Largo has a similar ability to Wapol.
 * Both Largo and Colt wear extremely large sombreros.