Rokuro lives with his older brother Goro. Rokuro is the first character seen in the film. He is first seen playing on a boat-like contraption in a lake. Rokuro's fun comes to an end when an earthquake drains the lake. when Rokuro and his brother return home, they discover that their home is ransacked, and traces of red sand on the floor near Goro's robot. Later on, Rokuro is seen tinkering with a small motorbike which he rides away, only to have himself be forced at gunpoint to unlock his house. this leads to he and his brother being kidnapped. they are eventually rescued by Goro's friend Hiroshi Jinkawa. After that, Rokuro aids in the recapturing of his home from the Seatopians by flying a toy plane into a Seatopian agent's face to provide a distraction. At the close of the film Rokuro is seen riding on Jet Jaguar's shoulders.
Rokuro rides his dolphin boat
Rokuro discovers the strange red sand at the feet of Jet Jaguar