Diego serves as a member of Team J.E.T., originally called the Junior Earth Team. He trained at Earth's Scan2Go Training Facility under Coach Ray before embarking on racing adventures across the universe. Physically large, Diego possesses a kind heart and sensitive nature. He lives at his own pace, avoids worrying about minor issues, and remains unconcerned about the fighting spirit buried within him. His love for eating is notable, with donuts as his favorite food.

His Scan2Go license displays an area number of "000" and a license number of "00000000"; the significance of these numbers is unclear beyond potential administrative oversight or symbolic representation.

A pivotal moment arises when Diego announces his intention to quit Scan2Go, revealing a shaken confidence his teammates initially mistake for a joke. This crisis of faith leads to a breakdown where he confronts his self-doubt. Through subsequent circumstances and fate, Diego experiences a realization that winning is not the sole measure of a universe-class Scan2Go racer. This understanding helps him regain perspective on his abilities and purpose within the sport.