Chase Reigami

**Chase** (チェイス, *Cheisu*) was a Roidmude who specialized in hunting down rogue members of his kind as Mashin Chaser (チェイサー, *Mashin Cheisā*, lit. "Advanced Demon Chaser"). Roidmude 000 or Protozero was the first roidmude created by Krim Steinbelt to carry out acts of justice as Kamen Rider Protodrive. However, following the events of the Global Freeze, he was reprogrammed as Chase, becoming Mashin Chaser, an enforcer of the roidmudes who deals with rogue members of their kind whilst developing a rivalry with the current Kamen Rider Drive. After his brainwashing is reversed by Kiriko Shijima, he re-aligns himself with humanity once more as Kamen Rider Chaser while also took on the name **Chase Reigami** (零神チェイス, *Reigami Cheisu*)

## History

Roidmude 000, also designated as Protozero, was a unique Roidmude created by Krim Steinbelt programmed with an infallible sense of justice. His genetic samples from his core were used by Krim to create Genetic Roidmude Trial 0 who would become known as Mayomi Reigami. Protozero remain inactivated for a period of time until the other 108 Roidmudes created by Banno had rebelled against humanity. Protozero was reactivated again by Krim, now having become the Drive Driver, to become Protodrive and protect the humanity while also at the same time take care of Mayomi as Krim would blame himself for having to leave him with the burden of taking care of Mayomi.

As the first user of the Drive system, Protodrive focused only on the task at hand and fought off the Roidmudes from out of sight. Protozero would give Mayomi a pendant that actually contained the Drive emblem hidden inside of it as a gift for getting into middle school telling her that everything will okay as he will always remain beside her. When Mayomi was 14 that night Mayomi was attack by a masked man which Protozero arrived to save her only for Mayomi to get shot which she then requested for her brother to protect humanity from any threat which her body vanished which he picked up her Shift Car.

After discovering from Roidmude 005's memories of the Roidmude's plan to start an all-out attack, Protodrive was mobilized during Global Freeze along with the rest of the completed Shift Cars. He would also save policewoman, Kiriko Shijima, from Roidmude 010. During a battle against Roidmude 002, he was viciously defeated and stripped away from the Drive Driver. Protozero was operated on by Roidmudes 002, 001, and 003 that reset his memories and transformed him into their loyal brethren. He is given a new name, **Chase**, and is given the Break Gunner, allowing him to transform into Mashin Chaser.

### Peirl of Machin 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 the Paint Roidmude, Crash 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 but however his conflicts with Kiriko made him remember a little girl which made Chase wonder who that little girl was.

During Christmas Eve, 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. This caused Mr. Belt to recognize Chase's true form.

### True Past And Redemption

After discovering his true Roidmude form, 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.

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 to reprogram Chase instead, making him more robotic and emotionless however unknown to Medic this would unknowingly awaken Chase's memory of his promise to his sister at the time of her death. In this state, Chase became a ruthless killer, even to humans which is a moral line that he would not cross however the memory of the girl's request would interfere with his mission which made him wonder who that girl was.

Soon Medic reveals that instead of resetting Chase's memory, she altered his main programming code to defend Roidmudes rather than humans, given that Protozero'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 who greatly bears a strong hatred for Roidmudes and their races, including Chase, regardless of his previous background as Protodrive however the memory of the girl keeps appearing in his memory.

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, the Roidmudes strike 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 as a hostage. However, due to Mach's interference and with Brain's tampering Medic's reprogramming, Chase temporarily regains his sense of self, only to be reprogrammed again afterwards. This new round of brainwashing maximizes his destructive nature, allowing Chase to kill anyone without regret. This prompted 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 Shijima found Chase alive underneath a bridge on the way home.

Chase later had a strange dream where he finds himself in a garden of white roses which he felt a familiar presence which he sees the same girl he saw in his memory which he asked her who she is however the girl smiled as she answered that his purpose was to protect humanity and that she was only happy that he is alive.

At an abandoned building, Kiriko Shijima uses Shift Car Mad Doctor inside the Break Gunner to heal his wounds. The next day at night, Chase awakens and asks if she was the one who rescued him. Kiriko responds by saying she 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 on his own, 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.

Despite regaining his memories, Chase was still lost as he's torn between being a Roidmude or a Kamen Rider. While Drive Type Dead Heat engaged Heart, Mashin Chaser arrived and injured Shinnosuke's right hand. This caused Chase to regret for what he did as he never wanted to harm a human but didn't want to see Heart get killed. Heart noticed his troubles and returned the Shift Speed Prototype to Chase until he decided on his own path. While Chase was still wandering around near the river, Kiriko came to him and brought him a small briefcase which contained a Mach Driver and the Signal Chaser which the girl's voice tells him to protect humanity and that it was always his mission. 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 eventually Jun would later give Chase the name Chase Reigami only for Genpachiro to translate it as Zero God.

Chase, being called in by Kiriko to save her brother, rushes to his aid with the Ride Booster. However, despite saving the latter, Go attacks Chase. Despite this, Chase, refusing to fight against a fellow Rider, undoes his transformation causing Shinnosuke to intervene to stop Go.

Later, Chase aids Shinnosuke in an operation that will remove his suspension on becoming Kamen Rider Drive, accepting the role gladly for saving him from Go in their previous encounter. Chase infiltrates the Special Investigation Office and attacks Nira in an attempt to allow Shinnosuke to transform to save the latter's life. Though Nira allows for Shinnosuke to transform, Nira faints. Chase would later face against Go once more and continues to refuse to fight against him, questioning if his mission is more important than his family. After Shinnosuke defeats the Seeker Roidmude, Chase ponders to himself the importance of a family.

### Joining The Special Investigation Unit

During the case where the killer of Shinnosuke's father, Negishi, is brought up, Chase intervenes in a fight where Shinnosuke's desire for revenge clouds his judgment to protect people. Though the Roidmude gets away thanks to the interference of Go who attacks both the Riders, Shinnosuke thanks Chase for helping him realize once more on what it's like to be a Kamen Rider.

Helping out at the Special Investigation Unit office, he realizes that Roidmude 001's ability to alter memories is not permanent and quickly concludes that Go must also be under the influence of him. Encountering Go once more, Chase swiftly defeats him and confirms his suspicion that Go is being influenced by 001.

After aiding to defeat Negishi and the Open Roidmude, Chase alerts Kiriko on the situation of Go and receives back his Shift Speed Prototype. Upon inserting it to the Break Gunner, Chase overloads and displays a projection of his last moments before being forcefully tortured and retooled, revealing the identity of 001 to Shinnosuke and Kiriko. Eventually he would remember his sister and would visit his old home and remember his sister's death which continues to haunt him for the rest of his life. Chase would be visited by Mayomi in his dream which he embraces her as Mayomi asked him if he remembers his purpose as Chase answers on whenever hears it he could not forget making Mayomi smile as his family love never vanished which Mayomi answers on how happy she is to see him alive and returned to the older brother she knew.

Chase later tried to learn the 001's plot by re-reading his past memory and learned that they were planning to create another new evolution. He soon arrived to halt the Reaper Legion from interfering Shinnosuke's battle with 001, who would later evolve into Freeze. After defeating them, he was attacked from behind by a still-manipulated Go as Mach.

After Shinnosuke's death, he would ask Rinna for an antidote, he proceeds to go to try and save Go, but also doubles as more or less a suicide mission to take down the Roidmude commanders to avenge his fallen ally. The container with the substance to fix those with altered memories is destroyed. Despite his best efforts, Freeze is easily able to overwhelm him along with assistance from Mach. Luckily for him, Go reveals he faked having his memories re-written and gives himself and Chase cover to escape. Fortunately, Go managed to provide a solution that allow Shinnosuke to be revived as Drive Type Tridoron.

Later, when Kiriko was attacked by Brain while Shinnosuke as Drive Type Formula was fighting against Heart, he prevented Brain from harming Kiriko and suggested that since their target, Captain Shiguta, was nowhere to be found, they should retreat and focus on their mission instead of fighting Heart.

The next day, Chase accompanied Shinnosuke to look after Yukari, the primary target of Nira after his dark truth had been revealed. Right on Shinnosuke's deduction, Nira as the Thief Roidmude made his move and Chaser working together with Drive, and also saved by Mach as they were almost defeated. After Nira's escape, Go warned Chase for not telling Kiriko about their father and also stated that they were not buddies. Yukari would remind Chase of Mayomi but sees a rash on her arm which he sent his Prototype Shift Car to follow Yukari as he remembered the day of her death. Nira would then scapegoat Special Investigation Unit on being criminals on the news which Chase saw on TV. Chase then tries to save Yukari but fails which he is not willing to give up on her and visit Go to have Banno treat her. Nira lies would be exposed and is later defeated and arrested.

## Other Event

### Lupin Challenge

When Special Investigation Unit received a letter from Lupin as Chase stated that he was once defeated by him. When fighting alongside Lupin and later Chase stating that he can't hate the person like him until Lupin steals his drivers resulting in him having to become Machin Chaser to get it back until his sister arrives as Belle Rose who received an anonymous email from Bête Z which Lupin reveals himself to be the Bête Z which he flirts with her much to Chaser's dismay which Chase later being an overprotective sibling tells him to backoff on his little sister which Lupin then teasing calls Chaser Grim Reaper nii-san much to his annoyance which Go and Shinnosuke, and Krim chuckle.

### Kamen Rider Chaser

When Chase fights 051 whom Chase had remember defeating him twice as Protodrive and Machin Chaser but when Hinako Tamiya gets attacked in the crossfire but however to Chase's dismay that Mayomi arrived at the scene which 051 comet on how beautiful the Grim Reaper's little sister the preclean doll is which he is about to shoot her if it hadn't been for the Angle saving her which a worried Chase asked Mayomi if she was all right which she nods with a yes which Chase then sees the person who saved his sister that Chase figured that she was a roidmude as she also responds that she is indeed a roidmude just like him along with the child who was created from his own core as she also ask him if this was his way of thanking her for saving his sister. Chase would later take Hinako to a hospital and would scold Mayomi for her carelessness which lead to a sibling quarrel

## Personality

Chase is a kind and brave individual, traits of a true Kamen Rider. Initially in his limited days as Protodrive, Chase was stoic and almost emotionless, as well as feeling contempt at answering his enemy's questions. Confident and serious, Chase risked his life along with his partner Krim Steinbelt to prevent the Roidmude from subjugating humanity, as per his programming.

Upon being reset and modified into the roidmude's guardian as Mashin Chaser, Chase had lost his memories as a Kamen Rider. Like his time as Protodrive, he portrayed himself as a servant, blaming himself and not fighting back against Brain who calls him a "reject" when the former started to receive spasms about his past memories as Protodrive. Despite his modification, Chase still subconsciously felt concern towards humans, to his own confusion. Moreover, his sense of fairness remained as well, as shown through his interactions with Shinnosuke Tomari/Kamen Rider Drive.

When Medic modified him though, Chase had lost almost all sense of concern for humans. He had also lost his sense of honor, having little qualms towards the kidnapping of others. However, his feelings of camaraderie remained and became enhanced, causing him to be relieved of his duty as the Grim Reaper. but however, despite his reprograming his memory of his sister who act as his conscious.

After being healed by Kiriko Shijima and the Mad Docter Shift Car, Chase finally returned to his former self as Protozero. However, the time he spent as Mashin Chaser caused Chase to feel conflicted between his loyalty towards the humans and the Roidmudes. Through Kiriko's actions though Chase was convinced to restart and become a Kamen Rider once more, feeling it to be the right thing to do.

Despite returning as a Kamen Rider, Chase still felt doubt in himself, primarily due to his past actions as Mashin Chaser. Along the way of reintegrating back with humans, Chase helped both his successors in doing the right thing, having come to terms with his own role as a Kamen Rider. However, Chase was deeply traumatized by his sister getting killed in an assault which he would rather keep her out of roidmude battles but refuse to allow her involve with his mission by saying that it's adult job which led to numerous sibling quarrels.

Despite his serious personality he deep cares about his genetic relative, little sister Mayomi although despite her being a different type of roidmude but there were times when her peak human strength frightens him but also is willing to protect humanity for his promise to his sister a promise, he made for Mayomi after her death. According to Banno Chase also process great fear for her which Banno abducted her and threatened to kill her if he did not return as Machin Chaser but his fear is further taken advantage by Angle who sent an any

## Notes

* Chase shares some inspirations for Sou Fueki.
* It is later shown that Chase is popular with girls as when two idols asked Kiriko as Belle Rei to give Chase's their letters which are revealed to be love letters.
* Chase always like coffee with no latte
* A running gag is the Reigami siblings' quarrels would draw attention to civilians which lead to Shinnosuke answering on siblings am I right which Heart would say the same thing.