Do Gone is the Captain of the pirate ship Red Blood Do Gone. He used to be the Mujyakey father's right hand man. When Mujyakey's father, Growald Serpent, died and Mujyakey became the Captain he betrayed his shipmates.
In the end, his betrayal was meant as a means for Mujyakey to become a better pirate. Do Gone was supposed to compete with Mujyakey for Growald's treasure and if Mujyakey found it first, it was proof she was a worthy pirate and Captain