Daiboke, meaning "Big Kid," is a member of Jiraiya's thief gang, partnered with his counterpart Koboke ("Little Kid"). He keeps running and maintains the gang's diverse mechanical contraptions, most famously a wooden tank that doubles as a submarine. This unique vehicle is propelled by a bicycle-style pedal system. Daiboke and Koboke function primarily as technical support helpers, jointly managing the gang's eccentric inventions during their endeavors through their tight-knit partnership.