Trixie Fontaine works as a reporter and aspiring camerawoman, documenting racing events and associated investigations. She first encounters Speed Racer during his early racing career, forming a professional rapport that develops into a close partnership. Her younger brother, Spritle Fontaine, frequently accompanies her, altering the original series' family structure where Spritle was Speed's brother. Trixie aids Speed's quest to uncover the truth behind his brother Rex's disappearance and the mysteries of the Mach 5. She assists investigations into corporate espionage, racing conspiracies, and other challenges during the Earth Grand Prix circuit. Her role expands beyond reporting as she actively supports Speed against antagonistic forces, including Team Exelion and rival racers. During the science-fiction arc, Trixie joins Speed and allies in time-travel missions after the Mach 5 gains temporal traversal capabilities. She participates in confronting the alien tyrant Handler and the search for the Ezekiel Wheel across multiple eras. Trixie's character evolves from Speed's initial acquaintance to a trusted ally and romantic interest. Their relationship deepens through shared experiences in racing endeavors and investigative pursuits.