Retsu Seiba

Height: 124 cm (roughly 4'1") Hometown: Japan
Cars: Sonic Saber, Vanguard Sonic, Hurricane Sonic, Buster Sonic, and Blitzer Sonic.

Retsu is one of the two title characters. He is a fifth-grade student who is 11 years old, and Go's older brother. Although he is able to control his patience better than his brother, he still lets out his annoyance with someone once in a while. Together with Go, they are known as the "Let's Go Brothers". In WGP, he is the captain of the TRF Victorys. He likes to collect postcards.