Kamen Rider Mach Chaser (Chaser ver.)

Mach  Chaser "Signal Bike! Rider: Mach! (Groovy music)"

- Transformation announcement

Mach Chaser (マッハチェイサー) is Chaser's hybrid form, which is an amalgamation of himself and Kamen Rider Mach. Accessed through the Signal Mach Bike, this form's appearance is a mix of Chaser's upper half and Mach's lower half. It shares its name with Mach's second hybrid form accessed through the Ride Crosser Shift Car.

To access this form, Chaser has to insert Signal Mach into his Mach Driver Honoh after utilizing Signal Chaser in a similar manner to how he activates a Signal Exchange Bike. Once initiated, a portion of Mach's armor parts envelop Chaser's body while remnants of his own armor parts are left behind. This form is not listed under Chaser's configurations and blueprints for his forms.

In this form, Chaser's abilities skyrocket beyond that of the individual abilities of his and Mach's, allowing him to easily fight and overwhelm Gold Drive whereas even Drive in Type Tridoron and the individual Signal Bike Kamen Riders could not faze him.

Mach Chaser's Full Throttle finisher is an unnamed Rider Kick that creates a projection of Kamen Rider Mach to aid him in the attack.

While Chaser can assume this form on his own, Mach Chaser can also be a fusion of Chase and Mach in a way similar to Kamen Rider Double.