Icon-zi-o.png This article is about a/an rider in Kamen Rider Zi-O.

In a timeline where Drive doesn’t exist, Chase (チェイス Cheisu) did not ally himself with humanity, instead fighting alongside the other Roidmudes as Mashin Chaser (魔進チェイサー Mashin Cheisā, lit. "Advance Demon Chaser").



2019: Vanishing Watches

Chase 2019.jpg

In 2019, Chase appears as Mashin Chaser, declaring himself the enemy of all Kamen Riders and attacking Geiz Myokoin and Woz. Rather than being one of Another Decade's summoned Dark Riders, he is the original Chase himself, having been revived from Sougo Tokiwa obtaining the Drive Ridewatch. Due to the destruction of said Ridewatch however, the Roidmudes were brought back into existence, with Chase converted into their ranks. Geiz manages to stun Chase by pointing out the logical paradox in his words (he can't be the enemy of Kamen Riders if he comes from a world where Riders don't exist), then says that history has been altered and reminds him of the existence of Go Shijima, which causes Chase to faintly remember his sacrifice against Gold Drive. 2019: Vanishing Watches 

2068: Ohma

Just when Tsukuyomi was nearly attacked by a Roidmude, Mashin Chaser suddenly reappears to save her. Immediately afterwards, his transformation is canceled, with Chase reeling in confusion from his actions. Woz explains to him of his true origins as a Kamen Rider, aggravating Chase into attacking him as Mashin Chaser again. Amidst their battle, Woz is summoned by Sougo, leaving Chase alone with Tsukuyomi. Tsukuyomi pleads Chase to stop his rampage, stating that he should have a conscience as well. Despite Chase's denial, he finds himself unable to harm her. Swartz then appears in front of them, saying that he will personally finish off his little sister. Witnessing Swartz's action compels Chase to stop him, appalled by such cruelty. Outmatched as Mashin Chaser, Chase is mortally wounded, with Geiz appearing too late to save him. Holding Chase's damaged body, Geiz tells him that his friend is working to revive him, while also stating that they are his friends as well. Glad to hear these words, Chase expresses his admiration for humans before dissipating in a flash of light.



Due to the alteration of time, Chase lost his memory as Kamen Rider Proto-Drive and Chaser, instead believing himself to be a foe of all Kamen Rider. Once Geiz pointed out the flaw behind his overall logic however, Chase began to remember his previous life in Kamen Rider Drive, growing confused with himself.

Eventually, disgusted with Swartz's inhumane actions, Chase rebelled against him, believing that such cruelty is unacceptable. Near his second demise, Chase fully regained his appreciation towards humanity, being grateful to Geiz for his kindness.

Mashin Chaser

While Chase uses the Break Gunner to transform into his battle form, unlike the Roidmudes who require Viral Cores as it comprises their body, Chase can use Viral Cores to augment Mashin Chaser's power further. This power-up is known as Tune Chasers (武装チェイサー Busō Cheisā, lit. "Armed Chaser") and each Tune Chaser have their own weapons powered by the E-Circular (E-サーキュラー Ī-Sākyurā) materializing from the Circular Dynamics (サーキュラーダイナミクス Sākyurā Dainamikusu) on his back. Whenever he executes a Full Break (フルブレイク Furu Bureiku) finishing blow, the silver pipes on his Night Hide Wear (ナイトハイドウェア Naito Haido Uea) suit called the G-Junction (G-ジャンクション Ji-Jankushon) empower the attacks made.

Mashin Chaser

Mashin Chaser

"(Heavy Metal-based standby music) Break Up! (End riff-based Heavy Metal music)"
―Transformation announcement[src]
  • Height: 202.5 cm[1]
  • Weight: 112 kg[1]

Ability Perimeters:

  • Punching power: 7.3 t.[1]
  • Kicking power: 12.2 t.[1]
  • Maximum jump height: 24 m.[1]
  • Maximum running speed: 100 m. per 6.9 sec.[1]

When brainwashed and fighting for the Roidmudes, Chase transforms into Mashin Chaser (魔進チェイサー Mashin Cheisā, lit. "Advance Demon Chaser"), where he is armed with the Break Gunner and drives the Ride Chaser. Since both Heart and Brain only wanted Chase to incapacitate rogue Roidmudes instead of fully destroying them, his arsenal as well was made not to kill their Cores, a trait that was shared from his first appearance as Protodrive.

This form is seen briefly before Chase's first transformation into Kamen Rider Chaser and is indeed still available to be accessed by Chase via the Break Gunner despite retiring it in favor of becoming a Kamen Rider again, as demonstrated when he became Mashin Chaser once more to save Go from Gold Drive following the destruction of his Mach Driver Honoh.

The Mashin Chaser suit includes the following accessories:

  • Nightmare Helm (ナイトメアヘルム Naitomea Herumu) - Head
  • Radiator Guard (ラジエーターガード Rajiētā Gādo) - Right-sided shoulder pad that draws heat from the surroundings as an internal cooling system.
  • Core Driviar-0 (コア・ドライビア-0 Koa Doraibia-Zero) - A built-in of the Core Driviar prototype.
  • Violet Guard (ヴァイオレットガード Vaioretto Gādo) - Several purple colored armor surrounding the Night Hide Wear. As a sample of an Advanced Roidmude, Chase shedded a piece of it with his Break Gunner. Giving it to Kiriko, it was then used by Rinna to modify the Rider systems to target Roidmude physiology exclusively to preserve human hosts of the Fusion Evolution State, as well as to create the Kamen Rider Chaser system by linking it to the second Mach Driver Honoh.
  • Death Head Shoulder (デスヘッドショルダー Desu Heddo Shorudā) - Left-sided shoulder pad.
  • Armed Impactor (アームドインパクター Āmudo Inpakutā) - Gauntlets
  • Revolt Brace (リボルトブレス Riboruto Buresu) - Wristbands
  • Raid Glove (レイドグローブ Reido Gurōbu) - Able to punch through 2 cm-thick iron plate.
  • Armed Enhance (アームドエンハンス Āmudo Enhansu) - Right-sided Armed Impactor.
  • Pad Impulsar (パッドインパルサー Paddo Inparusā) - Knee pads.
  • Strength Leg (ストレングスレッグ Sutorengusu Reggu) - Legs
  • Tracer Boots (トレイサーブーツ Toreisā Būtsu) - Feet

Appearances: Zi-O Episodes 47-48

Tune Chaser Spider

Tune Chaser Spider

"Tune: Chaser Spider! (Spider chirping and screeching noises)"
―Transformation announcement[src]
  • Height: 202.5 cm[2]
  • Weight: 127 kg[2]

Ability Perimeters:

  • Punching power: 8.6 t.[2]
  • Kicking power: 12.5 t.[2]
  • Maximum jump height: 24 m.[2]
  • Maximum running speed: 100 m. per 7.1 sec.[2]

Tune Chaser Spider (武装チェイサースパイダー Busō Cheisā Supaidā, lit. "Armed Chaser Spider") is Mashin Chaser's spider-based attachment extension form that he can assume by inserting the Chaser Spider Viral Core into the Break Gunner. This form debuts in episode 5.

In this form, Mashin Chaser is armed with the Fang Spidey (ファングスパイディー Fangu Supaidī) pincer.

Tune Chaser Spider's Full Break finisher is the Execution Spider (エグゼキューションスパイダー Eguzekyūshon Supaidā), where the E-Circular imparts energy into the Fang Spidey before Mashin Chaser slashes a hologram version of his weapon at the enemy.

Appearances: Zi-O Episode 48

Tune Chaser Cobra

Tune Chaser Cobra

"Tune: Chaser Cobra! (Monstrous cobra noises, followed by a tongue lick and a hiss)"
―Transformation announcement[src]
  • Height: 202.5 cm[3]
  • Weight: 127 kg[3]

Ability Perimeters:

  • Punching power: 8.1 t.[3]
  • Kicking power: 12.5 t.[3]
  • Maximum jump height: 24 m.[3]
  • Maximum running speed: 100 m. per 7.1 sec.[3]

Tune Chaser Cobra (武装チェイサーコブラ Busō Cheisā Kobura, lit. "Armed Chaser Cobra") is Mashin Chaser's cobra-based attachment extension form that he can assume by inserting the Chaser Cobra Viral Core into the Break Gunner. This form debuts in episode 7.

In this form, Mashin Chaser is armed with the Tail Whipper (テイルウィッパー Teiru Wippā) whip made out of a special liquid metal.

Tune Chaser Cobra's Full Break finisher is the Execution Cobra (エグゼキューションコブラ Eguzekyūshon Kobura), where the Tail Whipper physically detaches from Mashin Chaser's arm so that it can attack the enemy.

Appearances: Zi-O Episode 47

Chaser AW Core.png
The Core is the basic essence or 'soul' of the Roidmude. Chase's core is shattered when Chase defeated by Another Decade's Rider Kick. This core is only seen in Appearances: Zi-O Episode 47


  • 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
  • Break Gunner: Transformation device and personal weapon.


  • 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

Behind the scenes


Chase is portrayed by Taiko Katono (上遠野 太洸 Katōno Taikō). As Mashin Chaser, his suit actor is Yasuhiko Imai (今井 靖彦 Imai Yasuhiko).


  • Notably, Chase is the last Legend Rider to guest star in Kamen Rider Zi-O, albeit neither appearing in his Rider Form nor having his Ridewatch created.
  • When considering how an Another Rider is created (via distorting time and corrupting an individual with selfish desires) Chase can be considered as their antithesis, since he was turned into a member of Swartz's force by the Drive Ridewatch's effects, yet ultimately used his powers as Mashin Chaser to save Tsukuyomi in an act of heroism.
    • This is fitting when one remembers the original Double Riders, both being given great power by an evil force but choosing to fight for justice, something which Chase ended up doing as well.
  • Chase is the third Legend Rider to die in Kamen Rider Zi-O, following Michal Minato and Tsukasa Kadoya.
    • However, he is the second one to face permanent death, since Tsukasa was revived.


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