The two twins joined the Rumba Pirates over 50 years ago. When they crossed the Westblue, they met the little whale Laboon, who, lured by the music, accompanied them from then on. After passing Reverse Mountain, however, they left him at Cape Twins with Crocus, as the journey on the Grand Line would have been too dangerous for the little whale. After countless adventures on the Grand Line, however, their captain Yorki fell ill, leaving Brook in charge and separating from the gang to prevent the spread of infection.
Eventually, they encountered an enemy pirate gang that outnumbered the Rumba Pirates. The entire Rumba pirate gang was killed. Only Brook was able to come back from the dead, thanks to his Devil Fruit. Mizuuta Mawaritosuki succumbed to the poison of the enemy pirates in the process.
- His name was not revealed until the SBS to volume 53.