E-10000R

E-10000R (called Robo 1 on the official American website) is a red robot built for speed, and according to the official Japanese Sonic Riders website, is equipped with the same kind of engine as Metal Sonic. The 'R' may stand for red. Right before the Egg Factory race of the Heroes Story Mode, E-10000R accidentally walks in on a fight between Knuckles and Storm, and gets severly damaged. In the Babylon Story Mode, it tried to capture the heroes with a gang of E-10000Gs. During this confrontation, it had visible damage from the earlier battle, meaning it was same robot.

E-10000R has the ability to split its head from its body to scare/strike opponents or simply attack them with its large fists. E-10000R's unique Extreme Gear is called E-GearR, and it can be unlocked as a playable character after 50 hours of gameplay.

Like all the other robots from the E-Series, this one has other robots that look similar to it, but in different colors. For example, E-10000G is the clone of E-10000R, but in the color green rather then red. Also, there are two other robots in the Egg Factory course that appear to be yellow or purple clones of E-10000R.

In Sonic Free Riders, he has been replaced by E-10000B.

More Info
E-10000R is an Extreme Gear racing bot deployed by Doctor Eggman during Sonic Riders. It competes against Team Sonic and the Babylon Rogues in various races of the EX World Grand Prix and beyond. The robot is a playable character in free race or multiplayer modes, unlocked by clocking up over 50 hours of play-time. E-10000R is ostensibly a Speed type racer, and usually appears in the company of several E-10000G models - almost identical robots but for their colour. According to Sonic Channel, the robot uses a modified version of Metal Sonic's engine for power supply. Like E-10000G, the red E-10000R has headgear that looks remarkably like a backwards baseball cap. Unlike his mass-produced green brethren, however, E-10000R appears to be a unique machine, and is shown commanding the E-10000G horde when they attack Knuckles and Storm on Babylon Garden just before Sky Road. Its air-boost move shows E-10000R detaching its head and lifting it up to see further - presumably taking advantage of the injury it acquired in Egg Factory, when caught up in a brawl between Storm and Knuckles. More humanoid than earlier E-series robots like the E-100s, E-10000R never demonstrates having the kind of self-awareness exhibited by E-101 Beta or E-102 Gamma, although it is capable of speech.