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Chase is one of the two tritagonists of Kamen Rider Drive (alongside Go Shijima), initially serving as a major antagonist before becoming one of the main protagonists. He was the original Kamen Rider Drive, dubbed Kamen Rider Proto-Drive, until he was brainwashed by the Roidmudes to become the "Grim Reaper" Mashin Chaser to eliminate the current Drive and rogue Roidmudes. His true identity is Roidmude 000, also known as "Proto-Zero", a specialized Roidmude created by Krim Steinbelt.

He later breaks free of his brainwashing with help from Kiriko and Mad Doctor Shift Car. Once he's free he protects humanity from the Roidmudes once more, now calling himself Kamen Rider Chaser.

He was portrayed by Taiko Katono.


Kamen Rider Drive

Prior to the series, Chase was a unique Roidmude created by Krim Steinbelt that, unlike Roidmudes 001-108, did not have any negative emotions implanted onto him by Tenjuro Banno. His designation was labeled as Roidmude 000 or Proto-Zero (プロトゼロ|Puroto Zero) and he was the assistant of Krim Steinbelt. At an unknown point in time, he copied the appearance of police officer Koichi Kano.

Protodrive, along with the other completed Shift Cars mobilized to fight the Roidmudes during the Global Freeze. Despite being an unfinished prototype, Protodrive succeeded in destroying numerous Roidmude bodies, causing even Roidmude 002 to fall into despair. Chase's edge against the other Roidmude came to a close when Roidmude 009 evolved and gained the ability to restore Roidmude bodies, allowing Roidmude 002 to evolve into the Heart Roidmude. In his rematch against Roidmude 002, Chase was soundly defeated and stripped away from the Drive Driver. He was operated on by Roidmudes 002, 001, and 003, who wiped his memories and brainwashed him in the process.

Chase later appears before Heart and Brain after the destruction of the Iron Roidmude at the hands of Shinnosuke Tomari, the new Kamen Rider Drive. He is sent to find the one who destroyed the Roidmude and eliminate him.

After he and his comrades incapacitate and gained the rogue Roidmude 051's Core, Chase faces Drive for the first time, demonstrating his abilities with Mr. Belt comparing it to that of Protodrive. Soon, he would face the Kamen Rider again during the incidents of the Paint Roidmude, Crush Roidmude, and Scooper Roidmude. Chase began to question himself ever since he saw Kiriko for the first time when she shielded an untransformed Shinnosuke from being killed, causing him to be fixated on her. Nonetheless, whenever he faced Drive, he was always defeated after Drive's arsenal grew over time.

During the Dark Eve event, Chase failed to fulfill Brain's orders to defeat Drive and was poisoned by him. This revealed his Roidmude form, bearing the number 000. Chase notes that he has never seen it before and questions Heart about this, only for Heart to answer that Chase was a great warrior, and that zero is a privileged number. Despite Chase's mental breakdown, the Roidmude's main goal was accomplished: to revive Medic. Mr. Belt, saw Chase's Roidmude form through the Shift Cars.

Chase began to receive memories of and the voice of Krim Steinbelt. As the Ride Marcher and Ride Chaser combined into the Ride Crosser for the first time, Chase wondered why, until Brain came forward and explained that he was the warrior who fought the Roidmudes during the Global Freeze, Protodrive. With Chase's mind in ruins, Brain was going to dispose of him, however, Medic decided to brainwash him instead, altered his main programming code to defend Roidmudes rather than humans and making him robotic and emotionless. In this state, Chase became a ruthless killer, even to humans (a moral line that he would previously not cross).

Because Chase could no longer eliminate Roidmudes, his role as the 'Grim Reaper' was handed to the Reaper Legion.

Chase later decides to settle his rivalry with Drive. He draws out Shinnosuke by attacking the city, prompting Shinnosuke to fight Chase once more. However, thanks to the completed Trailer-Hou and Type Formula, Mashin Chaser is finally and truly defeated, made apparent by his core's destruction. Yet later, Chase was found alive by Kiriko underneath a bridge on the way home.

At an abandoned building, Kiriko uses Shift Car Mad Doctor inside the Break Gunner to heal his wounds. Later on, Chase leaves his bed and takes a stroll outside with a flower from Kiriko in hand. While wandering around, Kiriko asks for his help in obtaining a sample of an Advanced Roidmude. Chase forced himself to fulfill her wish and leaves her a piece of Mashin Chaser's Violet Guard.

Despite regaining his memories, Chase was torn between the Roidmude and the Kamen Rider sides of his nature. Heart later appeared and Shinnosuke attacked him using the with Drive Type Dead Heat for interfering with their talk. Just when Shinnosuke was about to win, Chaser transformed and attacked Shinnosuke, injuring him critically on his right hand. However, Chase starts to shake for his regret of harming a human, the only thing he wanted to avoid due to his programming. He became frustrated because he couldn't decide what is the best for him since not only does he not want to injure humans, he also can't take seeing Heart being killed. Heart noticed the confusion that Chase was showing, and deems him useless as he cannot decide his own path. Distraught, Heart returns Chase's Speed Prototype Shift Car, before leaving him. Soon, while Chase was still wandering around near the river, Ride Chaser came to him and brought him a small briefcase which contained a Mach Driver Honoh and the Signal Chaser. With that, Chase finally decided to redeem himself once more as Kamen Rider Chaser, rescuing Kiriko and destroyed the Sword Roidmude without killing its host. Afterwards, unknown to him not all people are glad to learn of his return, though only Go still hates him. He later wanders around the city still wondering if this is for the best.

Kamen Rider Zi-O

Mashin Chaser appears as one of the revived enemies of the Kamen Riders who were summoned due to the altered timeline and merging of several alternate worlds. Leading a group of Low-Class Roidmudes, Elementary Inves and Masquerade Dopants, Chase appeared to confront Kamen Riders Geiz and Woz. The two initially believed Mashin Chaser to be a Kamen Rider but Chaser corrected them, saying that there were no Kamen Riders where he came from and that he would destroy both of them for being Kamen Riders. Chase swiftly defeating both of them, but after Geiz asks him about Gou Shijima, Chase's memories from the original timeline start to come back, leaving him dazed as Woz and Geiz flee.


See Also


           DriveOfficialLogo.png Villains

Executives: Freeze Roidmude | Heart Roidmude | Brain Roidmude | Medic Roidmude | Mashin Chaser | Roidmude 004 | Roidmude 006 | Gold Drive | Roidmude 089 | Revenger Roidmude | Angel Roidmude | Paradox Roidmude | Sigma Circular | Roidmude 5886
Advanced: Sword Roidmude | Tornado Roidmude | Paint Roidmude | Gunman Roidmude | Crush Roidmude | Volt Roidmude | Imitation Drive | Iron Roidmude | Voice Roidmude | Scooper Roidmude | Seeker Roidmude | Judge Roidmude | Open Roidmude | Cook Roidmude | Shoot Roidmude | Thief Roidmude | Cyberoid ZZZ
Reaper Legion: Roidmude 013 | Roidmude 015 | Roidmude 019 | Roidmude 021 | Roidmude 022 | Roidmude 028 | Roidmude 032 | Roidmude 034 | Roidmude 035 | Roidmude 041 | Roidmude 044 | Roidmude 045 | Roidmude 054 | Roidmude 059 | Roidmude 070 | Roidmude 075 | Roidmude 080 | Roidmude 081 | Roidmude 083 | Roidmude 092 | Roidmude 094 | Roidmude 100 | Roidmude 101 | Roidmude 104 | Roidmude 105
Cobra-Type Roidmudes: Roidmude 014 | Roidmude 031 | Roidmude 037 | Roidmude 038 | Roidmude 049 | Roidmude 052 | Roidmude 055 | Roidmude 057 | Roidmude 062 | Roidmude 063 | Roidmude 073 | Roidmude 074 | Roidmude 082 | Roidmude 085 | Roidmude 086
Spider-Type Roidmudes: Roidmude 012 | Roidmude 018 | Roidmude 020 | Roidmude 025 | Roidmude 036 | Roidmude 039 | Roidmude 042 | Roidmude 046 | Roidmude 047 | Roidmude 056 | Roidmude 060 | Roidmude 064 | Roidmude 078 | Roidmude 079 | Roidmude 084 | Roidmude 093 | Roidmude 097 | Roidmude 102
Bat-Type Roidmudes: Roidmude 011 | Roidmude 016 | Roidmude 026 | Roidmude 040 | Roidmude 048 | Roidmude 051 | Roidmude 053 | Roidmude 061 | Roidmude 066 | Roidmude 068 | Roidmude 069 | Roidmude 071 | Roidmude 076 | Roidmude 077 | Roidmude 087 | Roidmude 088 | Roidmude 095 | Roidmude 096 | Roidmude 098 | Roidmude 103 | Roidmude 107
Other: Lost Number Roidmudes | Future Roidmudes

Hajime Taga | Itsuro Negishi | Koichi Sakaki | Koya Nishihori | Kisaburo Sasamoto | Makoto Asamura | Matsutaro Okumura | Mitsuhide Nira | Reiko Nishihori | Shunsuke Kusaka | Takuro Mogi | Tenjuro Banno | Zoruku Tojo

Keisuke Okamura | Roidmude 012 | Roidmude 055

Great Leader of Shocker | Kyoichiro Kuroi | Kamen Rider 4 | Roidmude 089 | Hiruchameleon | Turtle Bazooka | Roidmude 016 | Roidmude 057 | Roidmude 076 | Arimammoth | Cheetahkatatsumeri | Kamen Rider Ouja | Kamen Rider Sasword | Kamen Rider Dark Kiva | Kamen Rider Baron

Kibaoni Army Corps
Kyuemon Izayoi | Hitokarage

Leader of Mu | Oogumo Great Leader | Cancer Zodiarts | Gremlin | Demushu | Gamma Superior | Guren Graphite | Kamen Rider Dark Kiva | Kamen Rider Wiseman | Kamen Rider Poseidon | Kamen Rider Duke | Kamen Rider Dark Ghost | Kamen Rider Another Para-DX

Megahex Collective
ZZZ Megahex | Mecha-Kaito Kumon | Lost Number Roidmudes

Da Vinci Gamma | Michelangelo Gamma | Raffaello Gamma | Gamma A

           Zi-O Logo.png Villains

Time Jackers
Swartz | Uhr | Ora | Tid | Finis

Another Riders
Another Build | Another Ex-Aid | Another Fourze | Another Faiz | Another Wizard | Another OOO | Another Double | Another Den-O | Another Kuuga | Another Gaim | Another Ghost | Another Shinobi | Another Quiz | Another Ryuga | Another Kikai | Another Zi-O | Another Blade | Another Agito | Another Ryuki | Another Hibiki | Another Kiva | Another Kabuto | Another Den-O II | Another Drive | Another Decade | Another Zero-One | Another 1 | Another Diend

Oma Zi-O's Army
Oma Zi-O | Woz | Kasshin | Dai Mazines

Future Riders
White Woz | Kamen Rider Ginga

Legendary Riders
Masato Kusaka | Kaito Kumon | Tsukasa Kadoya | Hajime Aikawa | Daiki Kaito | Shun Kageyama | Katsumi Daido

Another World Riders
Kamen Rider G4 | Kamen Rider Fuma | Kamen Rider Dark Ghost | Kamen Rider Rey | Kamen Rider Eternal | Kamen Rider Woz | Kamen Rider Yuuki

Kamen Rider Barlckxs | Kagen | Jogen | Woz | Kasshin | Dai Mazines

Tid's Army
Masquerade Dopants | Waste Yummies | Stardust Ninja Dustards | Elementary Inves | Ghouls | Lost Number Roidmudes | Gamma Commandos | Guardians | Hard Guardians

Swartz's Army
Monsters: Strong Smash Hazard | Mashin Chaser | Elementary Inves | Orion Zodiarts | Shika Inves | Utopia Dopant | N-Daguva-Zeba | Sagittarius Zodiarts | Gamedeus | Kamen Rider Evol
Footsoldiers: Guardians | Masquerade Dopants | Elementary Inves | Lost Number Roidmudes | Ghouls | Gamma Commandos | Bugster Virus

Salis Worms | Gryllus Worm | Imposter Shun Kageyama

Waste Yummies | Gamma Commandos | Humanoise | Mole Imagin | Narutaki

Rider Time Shinobi
Niji no Hebi
Yaminin | Stardust Ninja Dustards

Rider Time Ryuki
Tatsuya Kano | Takeshi Asakura | Jun Shibaura | Dark Shinji | Ishihashi | Tozuka | Kamen Rider Odin