The former rulers of the Mokomo Dukedom are ¹ ² ³:
- Duke Hitsugisukan: a sheep mink and the former ruler of the Mokomo Dukedom before Inuarashi and Nekomamushi.
- Inuarashi: a canine mink and a former member of the Whitebeard Pirates and the Roger Pirates, who served as the ruler of the Mokomo Dukedom during the daytime hours, from 6:00 AM to 6:00 PM.
- Nekomamushi: a feline mink and a former member of the Whitebeard Pirates and the Roger Pirates, who served as the ruler of the Mokomo Dukedom during the nighttime hours, from 6:00 PM to 6:00 AM.
