The Moon Pirates are an infamous pirate crew originating from North Blue. Following the crew's second journey into the Grand Line, they were defeated and captured by the Marines, led by Vice Admirals Charter Spring II and Funori, and sent to Impel Down. Prior to its disbandment, the crew was led by its captain, Grain. The crew was known for causing trouble especially during the nighttime, and under the presence of the moonlight; this notorious behavior played an instrumental role in dictating the crew's name.
Following its disbandment, Kusagi is the only remaining active member of the crew.
The crew's jolly roger is a crescent shaped moon beside a spherical object, stated by Grain to represent the world. Following this aspect, the flag is symbolic of the crew's quest of conquering the world, as the moon is like an open mouth devouring the earth.
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- The crew's Jolly Roger is taken from the symbol of the Ōtsutsuki Clan from the series Naruto.