Captain Shalop was a captain in the Atlantic Kingdom's navy when he was maimed in battle with the United States Navy.  As a result, he lost his left arm in battle.  In the Atlantic Kingdom, that meant mandatory retirement through death.

He escaped instead and was found by a band of Maritime Marauders in a submarine.  Rather than kill Captain Shalop, the Marauders recruited him as long as they helped each other; Shalop to go rescue his wife and child and the Marauders to 'raid' an Atlantic Kingdom city, and thus they did. Untold billions in gold and treasure were extracted from Neptunis by the Marauders, however, Shalop discovered that King Dolphin, regent to the Atlantic Kingdom, ordered Shalop's wife and son to be executed for Shalop's crime.  Shalop has never forgiven his Atlantic Kingdom home for the atrocity.  As such, a controlling DNA enzyme that King Dolphin put in every Ningren (his race) was removed by the Maritime Marauder's Master Engineer, thus allowing Shalop free independent control and thought for the first time in his life.

Thankful for being rescued, freed from control and at least helping to save his family, Captain Shalop has readily joined the Maritime Marauders and has begun to enjoy the luxuries and adventures of a pirate's life.

Although his fellow human pirate crewmen and women sometimes deem Shalop a 'sea monster', they agree that he is one of them and will follow his orders regardless.  Recently, Shalop has been 'freeing' hundreds of his fellow Ningren from the Atlantic Kingdom's control and now using said freed Ningren as his crew on his new pirate ship, "Shalop's Revenge". 

Today, Captain Shalop is still with the Maritime Marauders. His ship has performed impressive raids, although a bit bloodier than necessary. His Ningren crew adores him and the Maritime Marauders' leader, Captain Akula, has voiced high acclaim for Captain Shalop and his incredible piracy skills.  Shalop hopes to one day amass enough wealth to go independent of the Marauders, but still, he enjoys the pirate life and all his fellow pirates, so much so that he thinks he could easily do this another few years just for the adventure in it.