Kamen Rider Proto-Drive

Six months before the events of Kamen Rider Drive, during the Global Freeze, a mysterious black-colored vigilante was responsible for fighting and dealing with the Roidmude outbreak. Referred to as Kamen Rider Proto-Drive (仮面ライダープロトドライブ), he wielded an earlier version of the Drive Driver alongside the Shift Cars to protect and save Japan from destruction. He also saved Kiriko Shijima and at some point afterwards, he was assumed to be dead.

Proto-Drive wielded similar abilities to the current Drive, but lacked the ability to destroy the cores of the Roidmudes, effectively meaning that he could not truly end their reign. After his assumed death, Shinnosuke Tomari takes up the mantle to become Kamen Rider Drive.

Type Zero
Nothing much is known about Proto-Drive before the Global Freeze, only that he obtained his equipment through unexplained means and had experience with fighting Roidmudes for some time.

Global Freeze
Proto-Drive fought the Roidmudes during the Global Freeze. Granted the full arsenal of the Shift Cars, he was able to dispatch a number of them on his own. However, Mr. Belt stated that while he was able to force the majority of Roidmudes into submission, he could not effectively stop their invasion completely as he lacked the means to destroy their cores. Because of this, he was defeated and supposedly killed by Heart after the latter finished off Krim Steinbert. His untimely demise would then have a profound impact on Kiriko Shijima, a police officer that Proto-Drive saved on the day of the Global Freeze. It is suspected that Mashin Chaser was created from Proto-Drive's data the Roidmudes obtained after his supposed death.

Types
Assuming that his powers function similar to Kamen Rider Drive's, Proto-Drive has forms called Types (タイプ). Some Shift Cars alter the suit based on a certain attribute, whereas other Shift Cars arm Proto-Drive with a certain element or weapon, by changing the tire on Proto-Drive's suit for a Tire Exchange (タイヤ交換). These two types of Shift Cars can be used in conjunction with each other. Whether or not he could use other Shift Cars in such incomplete state, though, is currently unknown.

Devices

 * Drive Driver - Belt-based transformation device
 * Shift Brace - Bracelet-based transformation device
 * Shift Cars - Gives access to Proto-Drive's forms and powers, depending on which car is used. They also allow Proto-Drive to move normally during a Slowdown

Vehicles

 * Proto-Drive's motorcycle - Proto-Drive's Rider Machine