Chase (Drive)

"Those who are about to die do not need to know my name."

- Protodrive's pre-fight catchphrase

"I am Mashin Chaser, the guardian of the Roidmudes. Also known as...The Grim Reaper."

- Mashin Chaser introducing himself

"I will start over....with the package you sent to me."

- Chase's phrase to Kiriko after he chose the way of the hero

Chase (チェイス) is one of the main characters in the series, Kamen Rider Drive. Originally an assistant to Krim Steinbelt that aided him in the development of the Drive Driver, Chase was the original Kamen Rider of the series dubbed as Kamen Rider Protodrive (仮面ライダープロトドライブ). Prior to Global Freeze, Chase and Krim discover that the Roidmudes are planning a simultaneous attack on humanity. When "Global Freeze" initiates, Chase and the Shift Cars rush to aid people from the Roidmudes, but Chase was defeated and believed to be destroyed in this encounter by the Heart Roidmude.

However, in truth, Chase survived and was retooled with no memories of his past with reverse-engineered equipment based on Protodrive's. Under the name Chase, he is tasked to destroy a Roidmude's body if they go out of line, effectively "resetting" them and granting him the nickname, Grim Reaper (死神). Using Viral Cores in place of Shift Cars, Chase becomes Mashin Chaser (魔進チェイサー). In this form, he is able to rival the current Drive, Shinnosuke Tomari and can augment both Viral Cores and Shift Cars. Like Protodrive, Mashin Chaser cannot destroy Roidmudes.

Chase is revealed to be a Roidmude that is not part of the numbered 108 and is classified as Proto-Zero (プロトゼロ), a Human-Type (人間型) Roidmude.

After struggling with his desires of what he wants to do after being freed from Medic's retooling, Chase receives a Mach Driver Honoh and utilizes the Signal Bikes to become Kamen Rider Chaser (仮面ライダーチェイサー). In this process, he attempts to start over for Kiriko and becoems an ally to Shinnosuke Tomari. However, despite his surviving his last encounter with Drive before he decided to start over his life, Chase has not fully recovered from the sustained injuries.

Global Freeze
Chase was originally an assistant to Krim Steinbelt and the original user of the Drive Driver. Prior to Global Freeze, he and Krim tested out Drive's power, but shortly realized that Drive was still underpowered to fight against a Low-Class Bat Roidmude and is unable to destroy their cores. When Global Freeze is initiated, Chase mobilizes all available Shift Cars to aid him against the armada of Roidmudes, saving Kiriko Shijima, but was later defeated by Heart.

With his Shift Speed Prototype Car confiscated by Heart, he eventually is re-programmed by Brain, taking the name Chase and receives powers based off Protodrive, assuming the identity of Mashin Chaser. He is then employed as an overseer/bounty hunter to Roidmudes and will destroy their bodies (but not their cores) in the events that they become a liability.

As Mashin Chaser
Chase 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 face Drive for the first time, demonstrating his abilities which Mr. Belt noting it to that of Protodrive. Soon, he would face the Kamen Rider again during the incidents of Paint Roidmude, Crush Roidmude and Scooper Roidmude. However, out of all the conflicts, 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 hence was poisoned by Brain. This revealed his Roidmude form, bearing the number 000, which Chase notes that he has never seen it before. He 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.

Discovered past and re-brainwashed
"I am...a Kamen Rider?"

- Chase learns his true identity.

Chase began to receive memories of rescuing Kiriko and the voice of Krim Steinbelt. As the Ride Macher 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 came up with a sinister plan: brainwashing Chase, making him robotic and emotionless. In this state, Chase became a ruthless killer, even to humans (a moral line that he would not cross).

Soon Medic reveals that instead of resetting Chase/Proto-Zero's memory, she altered his main programming code to defend Roidmudes rather than humans, given that Proto-Zero's base programming cannot be erased. The only downside was that Chase could no longer perform his original duty of a Grim Reaper, which is also the reason why Chase really cares about the Roidmudes. Due to this, Chase now only works on defending the Advanced Roidmudes while his Grim Reaper role being handed to Medic's latest division, Reaper Legion. In similar cases, Chase would even form a rivalry with Go Shijima/Kamen Rider Mach, a youth whom greatly bears a strong hatred for Roidmudes and their races, including Chase, regardless of his previous background as Protodrive.

In order to settle his rivalry with Drive, Chase had demonstrated another trick of his sleeve, such as triggering the Ride Crosser combination. Furthered by his remodeling by Medic, all of them (minus Brain) strikes a plan to eliminate Drive. They first staged the "deaths" of human templates that past Roidmudes used as their human disguises, in order to lure Drive into mobilizing the Shift Cars for investigation. Once mobilized, they were quickly captured and enthralled by Medic to be Chase's assistants. After delaying Mach with Heart, Chase confronted Shinnosuke/Drive, overpowering him with the enslaved Shift Cars. Mashin Chaser later demonstrated his superiority by trapping the rider in Super Heavy Acceleration, bludgeoning Drive into submission, even leaving Type Dead Heat useless. Chaser later executed Triple Tune, attacking Drive with the enslaved Shift Cars rammed into him, until Drive revealed himself to have survived from the blaze and rose as Type Formula. Drive's new form easily counters the Super Heavy Acceleration, encapsulated all of the rogue Shift Cars and later cleared a path for escape through activating a Full Throttle finisher. Chase, irritated that he has been bested by Kamen Rider once again, agrees with Medic's plan to fight against Drive once more by kidnapping Kiriko to use as a hostage, revealing in the process that all the previously eliminated human templates were actually clone thralls of Medic. However, due to Mach's interference and with Brain's tampering of Medic's reprogramming, Chase temporarily regains his former self only to be reprogrammed again after rejecting the act of taking human hostages with disgust. This new round of brainwashing maximizes his destructive nature, allowing Chase to kill anyone without regret.

Chase 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, as made apparent by his core's destruction. Yet later, Kiriko found Chase alive 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. Afterwards, Chase awakens and asks if she was the one who rescued him. Kiriko responds by saying he did, and that she owed him one. Later on, Chase leaves his bed and takes a stroll outside with the flower from Kiriko in hand. While wandering around, Kiriko sought his help for a sample of an Advanced Roidmude. Chase forced himself to fulfill her wish, leaving her a piece of Mashin Chaser's Violet Guard.

Redemption and Reborn as Kamen Rider
Despite regaining his memories, Chase was still lost: He's torn between the Roidmudes and the Kamen Rider sides of his nature. Shinnosuke attacked Heart 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 started 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 he doesn't want to injure humans, he also can't take seeing Heart being killed. Heart noticed the confusion that Chase was showing and despite knowing that Chase would fight against him, Heart advised Chase to not think too much and do what he must and returning his Proto Speed Shift Car, 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 and the Signal Chaser. With that, Chase finally decided to redeem himself once more as Kamen Rider Chaser, rescuing Kiriko and destroyed Sword Roidmude without killing its host. Afterward, unknown to him not all people are glad to learn of his return, though only Go still hates him. He is later wandering around the city still wondering if this is for the best.

The Beginning Duel of the Bike Riders
Chase was called by Kiriko to save his brother and arrived alongside Ride Boosters. Despite he had saved Go, he was attacked instead after saving him. However, Chase did not fight back and reverted from his Kamen Rider form during being attacked (probably due keeping his promise to save Go from danger is also meaning to not harming him either). Before he was finished by the depressed Go, he was saved by Shinnosuke. He left them afterward.

Clearing Drive's Suspension and The Knowledge Of Family
Chase was asked by Shinnosuke to help him for an operation so that he is able to transform again. Chase gladly accepted his role as he owed Shinnosuke for rescuing him from Go's wrath. Chase transformed into his Roidmude form and pretended to attack Nira in the office of the Special Investigation Office, making him have no choice but to allow Shinnosuke a chance to transform again. Chase soon learned alongside Shinnosuke that Go's life was in danger. Accepting Kiriko's offer to help, Chase went with Shinnosuke with Ride Booster's assembling with Tridoron. Both of them were interrupted by three Bat-Type Roidmudes who were forcily evolved by Brain. After defeating them easily, Chase found Go almost killed Seeker Roidmude who fused with a female criminal. Go cancelled his finisher, but his hatred got out of patience, and he went into the state of killing anyone who got in his way. As Chase couldn't take Go seriously and asked him is the importance of his family that big, he was beaten badly and was almost killed by Deadheat Mach's Araburu Tire finisher until Shinnosuke came just in time to stop Go. After Seeker Roidmude reverted back to Roidmude 050 and got killed, he questioned himself of the importance of a family.

Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle
NOTE: The following events take place between episodes 9 and 10

When both Zoruku Tojo and Megahex arises, Chase, as well as other Roidmudes are surprised that their powers fell into the hands of more powerful figures. Believing that their technology only fits for the Roidmude race, Chase (and eventually other Roidmudes as well) was forced to form an alliance with Drive to stop the threat.

Chase also becomes one of the victims of the alterations to time made by Shocker, permanently making him Mashin Chaser. He intruded and attacked Drive and other Riders during the Rider Grand Prix, only to be defeated by Kamen Rider Black RX and the Ridoron.

Personality
During his early days as Protodrive, Chase portrayed himself as a servant and ally to the Drive Driver. Stoic and almost emotionless, he disliked answering his enemies' questions and had a habit of saying so before defeating them. After being rebooted as Mashin Chaser, he adopted an enforcer-like persona, protecting Roidmudes and eliminate those who disobeyed orders. Due to his job, he is feared by all Roidmudes, thus granted the title Grim Reaper which he believes is unfit since he can't destroy their Cores.

Since Brain's reprogramming on him was crudely done via removal of his memories as Protodrive, Chase eventually struggled with several portions of his old memories (especially of Kiriko) after several fights with Drive that nearly drives him insane, which only worsened when Brain revealed the whole truth. After Medic rebooted him, Chase had become more sinister than before. Despite retaining his original memories, he believed that he had finally "freed" himself from becoming humanity's tool, but only to be revealed that he has no such thing in mind as it was the result of Medic tampering with his base programming. Because of this, Chase also lost the ability to become the Grim Reaper to the Roidmudes.

Despite her efforts, Medic's effort to brainwash him would not keep him under the Roidmude's leash for long. Shortly after receiving "extra aid" (Brain's toxin), which undermined his previous programming, under the belief that it would help in his final confrontation against Drive, Chase's memories began acting up once more and it promptly causes him to be fixated on Kiriko again, and eventually remembered his true base programming.

"Kamen Rider is humanity's protector. There's no value in defeating him in his human form."

- Chase rejects Brain's plans of exposing Drive's identity.

His most notable and consistent trait throughout his entire tenure with the Roidmudes is his sense of honor. He flat out refused to advance the Roidmude cause using underhanded tactics and would only fight his earnest with the Kamen Riders. He goes so far as to avoid having to drag humans into his fights, challenging the riders face to face and only fighting them when they are transformed. This humanity showed itself in Chaser's debuting battle, opting to save the Sword Roidmude's human host instead of destroying both outright.

The only time his sense of honor was tarnished was when Medic changed his programmings to suit her needs. Chase would come to realize this in his encounter against Go Shijima when Medic's programming was temporarily undone and again after surviving his "death" against Shinnosuke Tomari, while bearing a huge sense of guilt when witnessing Kiriko nursing him even after the misdeeds he had done before.

Equipment

 * Core Driviars: Kamen Rider Protodrive/(Mashin) Chaser's power source
 * Core Driviar-0: Protodrive/Mashin Chaser's power source, a prototype of the Core Driviars
 * Core Driviar-ONE: Kamen Rider Chaser's power source, which enable him to create Super Heavy Acceleration based on his Roidmude form's upgrade

Devices

 * Kamen Rider Protodrive
 * Drive Driver: Belt-based transformation device
 * Shift Brace: Bracelet-based transformation device
 * Mashin Chaser
 * Break Gunner: Transformation device and personal weapon
 * Viral Cores: Gives access to Mashin Chaser's forms and powers, depending on which car is used. As Protodrive, it allowed him to read the memories of the Roidmude the Core came from, provided it wasn't severely damaged.
 * Shift Cars: As he was formerly the previous Drive, he can use them in his Break Gunner and upgrade his projectiles with their powers. He temporarily gained possession of the Tire Exchange Shift Cars after Medic brainwashed them, but can also simply grab them from the air if Drive summons them first.
 * Kamen Rider Chaser
 * Mach Driver Honoh: Transformation device, created by Rinna via reverse-engineering from the original one
 * Signal Bikes: Gives access to Kamen Rider Chaser's forms and powers, depending on which bike is used

Weapons

 * Mashin Chaser
 * E-Circular: Mashin Chaser's tire in his Tune Chaser forms, unfolding into an animal-based weapon.
 * Fang Spidey: Tune Chaser Spider's fang-based weapon via the Chaser Spider Viral Core
 * Tail Whipper: Tune Chaser Cobra's tail-based weapon via the Chaser Cobra Viral Core
 * Wing Sniper: Tune Chaser Bat's wing-based weapon via the Chaser Bat Viral Core
 * Kamen Rider Chaser
 * Shingou-Ax: Chaser's primary weapon
 * Break Gunner: Chaser's secondary weapon, taken from his previous form.

Vehicles

 * Ride Chaser: Protodrive/(Mashin) Chaser's primary Rider Machine
 * Ride Crosser: Ride Chaser combined with the Ride Macher
 * Ride Booster Blue: Chaser's Rider Machine

Portrayal
Chase is portrayed by Taiko Katono (上遠野 太洸). As Mashin Chaser, Kamen Rider Protodrive, and Kamen Rider Chaser, his suit actor is Yasuhiko Imai (今井 靖彦), who was previously the suit actor for Kamen Riders Bravo and Kurokage (Ryoji Hase) in Kamen Rider Gaim.

Appearances

 * Kamen Rider Drive
 * Episode 0: Countdown to Global Freeze
 * Episode 1: Why Did My Time Stop?
 * Episode 2: What is a Kamen Rider?
 * Episode 3: Who Stole the Woman's Smile?
 * Episode 4: What is That Prideful Chaser Thinking?
 * Episode 5: What Are the Steel Robbers After?
 * Episode 6: Who Does the Warrior Fight For?
 * Episode 7: How Was That Decisive Moment Captured?
 * Episode 8: What is the Secret That Dwells in the Heart?
 * Episode 9: How Can I Get Used to the Cool Body?
 * Episode 10: What Is in the Belt's Past?
 * Episode 11: Who Can Prevent the Dark Christmas Eve?
 * Episode 12: Where Did That White Kamen Rider Come From?
 * Episode 13: Why Won't My Brother Put On the Brakes?
 * Episode 14: Who Is the Black Shadow Chasing Her?
 * Episode 15: When Will These Feelings Reach You?
 * Episode 16: Why is Rinna Sawagami Nervous?
 * Episode 17: Who Will Control Deadheat?
 * Episode 18: Why is Lt. Otta Following That Guy?
 * Episode 19: What Can Judge the Police?
 * Episode 20: When Did Kyu Saijo Become A Roidmude?
 * Episode 21: What Can Be Spoken By the Irregular Dead?
 * Episode 22: How Can I Use the F1 Body to Fight?
 * Episode 23: Who Can Stop the Hoax Smile?
 * Episode 24: What Can Keep Mach Running?
 * Episode 25: Why Has a New Battle Started?
 * Episode 26: Where is Chaser Going?
 * Episode 27: What's Go Shijima's Reason to Fight?
 * Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle