Ghigo (Go Saiba) is Retsu Seiba's younger brother, born approximately one year apart. His personality leans heavily towards impulsiveness, rashness, and impatience, creating a contrast with his brother, though he sometimes shows calmness and kindness. His visual design features a consistent blue theme, present in his hair, eyes, gloves, boots, and the goggles he habitually wears on his forehead. This blue color scheme also defines his Mini 4WD cars, exclusively from the raw speed-focused Magnum series. Specific models he races include the Magnum Saber, Victory Magnum, Cyclone Magnum, Beat Magnum, Lightning Magnum, and Bison Magnum.

Competing internationally during the World Grand Prix (WGP) arc as part of the TRF Victorys team, he primarily raced the Cyclone Magnum. The team faced rivals like Italy's Team Rosso Strada and Germany's Team Eisen Wolf. Within TRF Victorys, Ghigo formed a close friendship with J, the team's technical expert for car development and customization. His relationship with teammate Ryo Takaba evolved from rivalry into mutual respect and teamwork during this period.

Later, as shown in the *Return Racers* sequel series, Ghigo transitioned from Mini 4WD to become a professional racing driver. Personally, he owns a BMW Mini convertible. He encountered a boy named Tsubasa who expressed a desire to follow his legacy in Mini 4WD racing; Ghigo took Tsubasa on as his protégé, mentoring him in racing techniques and philosophy.

Physically, he is 120 cm tall and weighs 25 kg. His hobbies include reading manga and playing video games.