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Capitán Piel is the pirate captain on the SS Queen Alexis. He is the brother of Señor Hueso and the uncle of Hueso, Jr., who once tricked his brother into accompanying his crew on a mission, thus landing Hueso on the Hidden City Police's most-wanted list. Quite the opposite in composition to Hueso, Piel is completely made of skin.
After Hueso tells Leonardo that his brothers have been "portal jacked", they follow a series of clues leading them to the S.S. Alexis. Hueso and Piel fight, as Leonardo is forced to walk the plank by Piel's crew. In an attempt to save himself, Leonardo opens a portal to send the pirates away, but instead, causes his brothers to resurface from Tahiti, where they had been sent accidentally, but were enjoying themselves. Leonardo opens a portal in an effort to escape to Tahiti with his brothers, but ends up sending Piel and his crew there, instead.
- Senor Hueso: They are brothers as revealed by Senor Hueso. He tricked Hueso into doing a mission and thus became one of the most-wanted criminals in the Hidden City due to it
- His name translated to "skin" from Spanish.
- Whilst being boneless, Piel still has teeth visible when he talks or emotes, though this is likely for expression purposes only.