Mashin Chaser is a recurring anti-hero and later ally in Kamen Rider Drive. Originally created as a Roidmude-based hunter designed to pursue and eliminate Kamen Riders, he serves as a formidable enemy with a cold, relentless fighting style. Over time, he develops more individuality and shifts toward protecting others, especially against greater threats. His role in the series is that of a powerful former antagonist whose changing loyalties and inner conflict add depth to the story.