As a scientist and inventor, Gaogao-San frequently demonstrates his technological creations to Shimajiro and companions. His inventions, such as the self-feeding spoon and rocket shoes, often malfunction or fail during these demonstrations. He regularly accompanies the children on adventures using specialized vehicles like a giant digging machine, submarine, and airplane. During the events of Shimajiro to Niji no Oasis, he operates a Dig Bug robot that breaks down in the desert mid-tour, initiating the central plot where Shimajiro encounters a lost character. Gaogao-San's technological expertise and equipment consistently serve as catalysts for the group's journeys across diverse settings. His role remains that of a supporting character who facilitates exploration through his inventions, though their unreliability frequently leads to unexpected challenges. Gaogao-San's personal background, character development, and relationships are confined to his professional interactions with the main characters.