Kamen Rider Mach is a recurring supporting character in Kamen Rider Drive, known as Go Shijima in his civilian identity. He begins as a rival and later becomes an ally to the main cast, fighting against the Roidmudes. As a Kamen Rider, he is agile, impulsive, and highly competitive, often contrasting with Drive’s more composed style. His role in the series centers on his growth from a hot-blooded secondary rider into a dependable hero who helps protect humanity and confront the truth behind the enemy threat.