This article is about a/an rider in Kamen Rider Agito.

Shiro Mizuki (水城 史朗 Mizuki Shiro) is a soldier who becomes Kamen Rider G4 (仮面ライダーG4 Kamen Raidā Jī Fō, Masked Rider G4) , he is as one of the primary antagonists of the movie Kamen Rider Agito: Project G4.


Kamen Rider Agito: Project G4

Mizuki in the G4 armor with the suit's creator Risa Fukami.

He was one of the military personnel guarding the GA psychic educational facility during the time it was attacked by the Formica Pedes. Though he would survive the ordeal, he would be left a jaded man.

With his pride as a soldier shattered, Mizuki began living as one who would embrace death as the true means of becoming stronger. He would eventually volunteer as the operator for the G4 exo-suit and, as fate would have it, clash with G3-X operator Hikawa, to put their ideals to the test on the battlefield. But throughout the course of the battle, the G4 begins to suffer malfunctions.

Despite this, Mizuki refused to surrender. In the end, Mizuki would succumb to the strain placed upon him by the G4 and die. The G4's AI attempted to rise and continue the battle, but was destroyed by Hikawa.

Kamen Rider Decade

Rider War

01.Rider War.png

Kamen Rider G4 appears with other kamen Riders commanded by Wataru Kurenai ,but all are murdered by Decade in the episode 1 of Kamen Rider Decade in the dream of Natsumi Hikari and then conclude the dream with Decade as only Rider in the Rider War Rider War

The World of Kuuga

Kuuga Ultimate Form vs. Decade.png

Kamen Rider G4 with the other Riders appears when Natsumi remenber your dream of the Rider War, the dream ends shock of fists between Decade and Kuuga . The World of Kuuga

The Destroyer of Worlds

All the Riders killed by Decade.

In the special version of episode 31, Kamen Rider G4 is seen as one of the many Kamen Riders who fought in the Rider War against Decade and were all destroyed. They were presumably restored after the destruction (and subsequent revival) of Decade at the end of the Rider War and the worlds were restored. The Destroyer of Worlds

Episode Yellow: Treasure de End Pirates

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During the events of Episode Yellow: Treasure de End Pirates, Kamen Rider Diend Complete Form summons G4 alongside seven other Movie Riders using the Attack Ride Card Gekijouban to defeat Kamen Rider G Den-O.  Here, G4 uses Gigant , possibly in order to better go along with the other Riders' ranged finishing moves (as occurred with Kamen Rider Glaive's Gravity Slash).

Kamen Rider Heisei Generations FOREVER


Kamen Rider G4 appears as a toy, when Sento Kiryu and Sougo Tokiwa they find Ataru Hisanagahe brings them to his room which is filled with Kamen Rider memorabilia, with Sougo and Sento stunned to see toys of themselves. Ataru reveals that Kamen Riders are fictional.Kamen Rider Heisei Generations FOREVER  

Appearances in other media

Kamen Rider Decade: All Riders Super Spin-off

That One! Jiro Okamoto: Final Blow Diet!!

Kamen Rider G4 appears cited as example of the riders that portrayed the Suit Actor Jiro Okamoto with Caucasus,Ryuga,Odin,Nega Den-O,Leangle and Black later he does not appear in the quiz with the other Riders.

OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~

Type14. - Grandma's Lucky Food!


Kamen Rider G4 appears with Stronger,Accel and OOO Latoratar Combo,according by Momotaros G4 is consider the devil rider.Type14. - Grandma's Lucky Food!

Type44. - Quietly Listen! Underwear, Myself and Underwear


Kamen Rider G4 appears with Kaixa,X and TheBee Masked Form,according by Sieg G4 is consider by Sieg a lover for womens.Type44. - Quietly Listen! Underwear, Myself and Underwear

Video Game appearances

Kamen Rider Agito video game


In the Kamen Rider Agito game for the Playstation, while G3/G3-X has limited fighting time and will instantly K.O after the time is over, G4 doesn't suffer that limitation, possibly because G4 is a more advanced version and has successfully eliminated the weakness of G3/G3-X system.

Kamen Rider Battle Ganbaride

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Kamen Rider G4 with G3 ,G3-X and G3 Mild appears as a playable character with other kamen Riders of Heisei and Showa Era in this video game Kamen Rider Battle Ganbaride.

Kamen Rider Riderbout

G4 as seen in Kamen Rider Riderbout

Kamen Rider G4 appears as a playable character with the other Heisei and Showa kamen Riders in Kamen Rider Riderbout.

Kamen Rider Batton-Line

G4 in Batton-Line

Kamen Rider G4 appears as a playable character in Kamen Rider Batton-Line among other Riders in the game.

Kamen Rider Battride War II

G4 in Kamen Rider Battride Wars II.

G4 reappeared in Kamen Rider: Battride War II as a boss fighting against Kamen Rider Agito and Kamen Rider G3-X,G4 is a rider who is good at long-distance attacks, including continuous fire attacks with the modified GM-01 special weapon type. It also uses the Gigant missile launcher. In addition to shooting directly, he also shoots around himself.

Kamen Rider Battle Rush

Kamen Rider G4 appears as a playable and support character in the video game Kamen Rider Battle Rush using Gigant.

Kamen Rider Transcend Heroes


Kamen Rider G4 appears as a playable character with others Kamen Riders in the video game, performer his Gigant against his enemies Kamen Rider Transcend Heroes.

Kamen Rider Buttobasoul


Kamen Rider G4 is a playable character with other Kamen Riders of Heisei-Era , Neo-Heisei-Era and other monster and Villians in Kamen Rider Buttobasoul.

Kamen Rider G4 Medal

Other Game appearances

Masked Rider Expansion

Kamen Rider G4 Masked Rider Expansion card

Kamen Rider G4 appears as a playable character in this trading card game with other Kamen Rider Kamen Rider Heisei-Era , Showa-Era,super sentai,Metal Heroes and other Heroes.


After being saved by Hikawa during the raid of Formica Pedes, Shiro's personality had taken a warped fixation on the concept of death. He belives that strength comes from embracing death, where one no longer clings to life as a whole, whether it be the lives of others or their own. This new Consequentialist-esque view in strength had warped his morality, not being afraid to sacrifice the life of Mana and not feeling lost over the deaths of his own men who had previously worn the G4. It is believed that the reason he clings to death as he fights is due to his failure in protecting the facilitators, children, and his comrades during the raid, as he once shown doubt both his views and in his actions after Hikawa's speech about his views on life.


Fighting Style

Being a mercenary, Shiro advances the mercenary martial art. This leads Shiro able to be a perfect balanced fighter


  • Advanced Military Combat
  • Peak-human Durability: As the candidate user of G4, Shiro held the longest duration for able to survive on using G4 before the system's weakness was covered with an esper like Mana Kazaya.


  • G4 Overload system: As mentioned by Sumiko, G4 is made too powerful even for human to be used. Using G4 for too long eventually lead the user to have an android personality like after the death and completely vulnerable to any attack.

Kamen Rider G4

Kamen Rider G4

Kamen Rider G4

Rider Statistics:[1]

  • Rider Height: 198 cm
  • Rider Weight: 187 kg

Rider Senses:[1]

  • Eyesight: 15 km
  • Hearing: 15 km

Ability Parameters:[1]

  • Punching Power: 4 t
  • Kicking Power: 13 t
  • Resistance: Hardness 10
  • Maximum Jump Height: 25 m
  • Maximum Running Speed: 100 m per 7.5 seconds

Special Attacks:

  • Gigant: 30 t[2] x 4

Generation 4 is the successor to the G3-System. It was conceptualized by Sumiko Ozawa based G3-X. However, the system was deemed far too dangerous for use, so Ozawa never included the adjustments in the design schematics. However, Risa Fukami would steal the plans and construct the G4 System herself, adding a Prediction System to improve the AI. Unlike G3, the design of which was based on Kuuga, G4 is based on Agito. G4 is much stronger than any iteration of G3. However, its advanced AI causes it to suffer similar issues to G3-X.

Kamen Rider G4 has the following parts:

  • Red Eyeser (MDSS・Ver3) (レッドアイザー(MDSS・Ver3) Reddo Aizā (MDSS・Ver3)) - The sensitivity of the lens of the previous MDSS is adjusted to high and the strength of the lens is also improved. Visibility is 3 times than that of the previous version.
  • Perfector (パーフェクター Pāfekutā) - It produces oxygen from water when underwater, decomposes and filters carbon monoxide and poisonous gases when in a fire, and supplies fresh oxygen to the user. This allows G4 to operate in various environments.
  • Generator Buckle (ジェネレーターバックル Jenerētā Bakkuru) - A fixture that connects the Power Converter Lung and the Turtle Shell. Inside is a pipe for circulating energy.
  • Power Converter Lung (パワーコンバーターラング Pawā Konbātā Rangu) - The power source of Kamen Rider G4 with a built-in small high-power generator. The electrical power supplied from the battery is converted to an output several times more powerful.
  • G4 Mark (G4マーク G4 Māku) - A crest that shows Kamen Rider G4 is operated under the jurisdiction of the SDF.
  • G Buckle (Gバックル G Bakkuru) - Kamen Rider G4 power gauge. It displays the power consumption of the battery on the back and flashes violently when the charge remaining is less than 1 minute. In addition, the “energy volume” on both sides can temporarily increase power.
  • Weapon Attachment Point (ウェポンアタッチメントポイント U~epon Atatchimento Pointo) - A connector on the right hip for the Gigant, it connects via a cable and supplies power to the weapon.
  • Energy Volume (エナジーボリューム Enajī Boryūmu) - Servo meters have been strengthened to 2.5 times than that of Kamen Rider G3 and can withstand impacts when jumping from a helicopter in the sky.
  • G4 Jacket (G4ジャケット G4 Jaketto) - The bodysuit. A soft material that has the toughness to repel bullets as well as providing excellent heat and cold resistance via electronic control.
  • Power Armor (パワーアーマー Pawā Āmā) - High metal protective pad. It is about 5 times stronger than special duralumin steel. The left Power Armor is labelled "G4".
  • Arms Mount (アームズマウント Āmuzu Maunto) - A holster for weapons. There is an electrode point to directly charge the weapon.
  • PLSS (Ver 3) - A dial that can be turned to control the electricity supply and send an electrical signal to the Gigant to release the launch lock.

Appearances: Project G4, Decade Episodes 1-2, 31 (Special Version only) , Treasure de End Pirates, Heisei Generations FOREVER (as a toy).



  • GM-01 Custom Type 4 - A modified version of the Kamen Rider G3's GM-01 "Scorpion"; a modular magnum pistol, stored on right hip, hand-carried in use.
  • Gigant - A shoulder-mounted missile launcher, mounted over the right shoulder when in use. Used as a finisher.

Rider Cards

Kamen Ride: G4

"Kamen Ride: G4"
―Diendriver summoning announcement[src]

G4 as summoned by Diend Complete Form.

G4 Gigant

Behind the scenes


Shiro Mizuki was portrayed by Ryo Karato (唐渡 亮 Karato Ryō). As Kamen Rider G4, his suit actor was Jiro Okamoto (岡元 次郎 Okamoto Jirō).

Concept Art


  • G4 can be considered the first movie-exclusive Kamen Rider of the Heisei era.
  • In terms of the users (Hikawa and Mizuki), the utilization of the G3-X and the G4 exo-suit near the end of Project G4 is reminiscent of the final battle between Kuuga Ultimate Form and N-Daguva-Zeba.
    • Shiro Mizuki and N-Daguva-Zeba also happen to be more willing to die (and end up doing so) for their motives, with Mizuki fighting for his ideals in life, and N-Daguva-Zeba fighting to accomplish either one of his goals.
  • Out of all Original Riders that returned in Decade, he's one of the numerous deceased Movie Riders to make a return in Decade.
  • Unlike the majority of Heisei Dark Riders, who are counterparts with the Primary Rider of their respective series, G4's counterpart is the Secondary Rider G3-X, despite his armor being based on Agito.
  • In Kamen Rider × Kamen Rider W & Decade: Movie War 2010, G4's Gigant was used by Decade, through "Attack Ride: Gigant" card which means G4 may be carded by Decade.

G4-chip in Kamen Rider Decade



External Links

See Also

Icon-agito.png Kamen Rider Agito
Kamen Riders
Shouichi Tsugami - Makoto Hikawa - Ryo Ashihara - Kaoru Kino - Shiro Mizuki (Movie Exclusive) - Yukina Sawaki
Mana Kazaya - Professor Yoshihiko Misugi - Taichi Misugi - Dr. Higashi Kunieda
Tokyo Police Department
SAUL Team: Sumiko Ozawa - Takahiro Omuro
Police: Toru Hojo
The Akatsuki Survivors
Tomoko Miura - Saeko Shinohara - Aki Sakaki - Katsuhiko Sagara - Masumi Sekiya - Koji Majima - Jun Tachibana - Masahide Takashima - Kazuo Ashihara
The Lords
The Els: El of the Water - El of the Wind - El of the Ground
Jaguar Lords - Tortoise Lords - Snake Lords - Crow Lords - Zebra Lords -Jackal Lords - Bee Lords - Stingray Lords - Fish Lords - Lizard Lords - Ant Lords
View • [Edit]
Icon-decade.png Kamen Rider Decade
Kamen Riders
Primary: Tsukasa Kadoya - Daiki Kaito - Natsumi Hikari (movie only)
A.R. World Heroes: Yusuke Onodera - Wataru - Shinji Tatsumi - Kazuma Kendate - Takumi Ogami - Shouichi Ashikawa - Momotaros - Ryotaro Nogami - Souji - Asumu - Kotaro Minami (Black RX) - Kotaro Minami (Black) - Daisuke Yamamoto - Samurai Sentai Shinkenger - Joji Yuki
A.R. World Evil Riders: Chinomanako - Mimihiko - Kuchihiko - Kamen Rider Abyss - Dark Kiva - Ryuga - Orga - Dark Kabuto - Alternative
Other A.R. World Riders: Ren Haguro - Scissors - Zolda - Femme - Verde - Tiger - Imperer - Odin - Raia - Gai - Sakuya Hishigata - Mutsuki Kuroba - Takahiro Furuya - Kotaro Nogami - Arata - Ibuki - Zanki - Todoroki - Akira - Junichi Kaito - Haruka Miwa - Shin Magaki - X - Ixa - Saga
Prime Universe Kamen Riders: Shun Kageyama - Sou Yaguruma - Masato Kusaka - Takeshi Asakura - Kohtaro Minami - Kotaro Nogami - Shinji Kido - Yuto Sakurai - Dark Shinji - Makoto Hikawa - Shuichi Kitaoka - Shiro Mizuki - Riotrooper - Syuji Mihara - Leo - Yuji Kiba - Sakuya Tachibana - Hajime Aikawa - Junichi Shimura - Shin Magaki - Hitoshi Hidaka - Iori Izumi - Touki - Masato Mishima - Souji Tendou - Daisuke Kazama - Tsurugi Kamishiro - Arata Kagami - Issei Kurosaki - Hidenari Oda - Tetsuki Yamato - Keisuke Nago - Takato Shiramine
Hikari Studio
Natsumi Hikari - Kiva-la - Eijiro Hikari
Other Allies
Ai Yashiro - Kivat-bat the 3rd - Garulu - Basshaa - Dogga - Reiko Momoi - Ai - Mai - Mi - Yuri Tomoda - Toko Yashiro - Urataros - Kintaros - Ryutaros - Sieg - Deneb - Teddy - Kohana - Naomi - Owner - Toki - Yu - Grandma - Mayu - Natsumi Hikari - Chinatsu - Hikoma KusakabeIcon-crosswiki.png - KurokoIcon-crosswiki.png - Kurando TaniIcon-crosswiki.png - Masahiko Okamura (A.R. World) - Ritsuko Okamura (A.R. World)
Doctor Shinigami - Ambassador Hell - Apollo Geist - Ten-Faced Demon Llumu Qhimil - Shadow Moon - King Dark - General Jark - Bishium - Yuki - Schwarian - Televi Bae-Kun
Worlds of Black & Black RX: Scorpion Imagin - Seamoon Fangire - Mantis Fangire - Rhinoceros Mutant - Ox Orphnoch - Worm Orphnoch - Frilled Lizard Orphnoch - Brachypelma Worm Aurantium - Brachypelma Worm Viridis - Tarantes Worm Purpura
World of Decade: Shiomaneking - Ganikomol - Doras - Garai - Me-Badjisu-Ba - Zu-Mebio-Da - Me-Ginoga-De - Go-Gadoru-Ba - Leiurus Acutia - Formica Regia - Formica Pedes - Sheerghosts - Raydragoons - Psycorogue - Butterfly Orphnoch - Giraffe Orphnoch - Longhorn Orphnoch - Slug Orphnoch - Wild Boar Orphnoch - Pelican Orphnoch - Stinkbug Orphnoch - Arch Orphnoch - Elephant Undead - Giraffa Undead - Darkroaches - Kappa - Bakeneko - Hitotsumi - Coleoptera Worm Aeneus - Coleoptera Worm Croceus - Coleoptera Worm Argentum - Geophilid Worm - Subst Worm - Cassis Worm Gladius - Albinoleo Imagin - Mole Imagin - Rat Fangire - Sungazer Fangire - Bat Fangire
World of Amazon: Go-Jaraji-Da - Propheta Cruentus - Camponotus Worm Maxilla - Bakeneko - Yobuko
Dai-Shocker Combatmen - Dai-Shocker Scientists - Destron Combatmen
Super Shocker
Narutaki - Bee Woman - Neo Organism
Zanjioh - Jaguarman - Poison Lizard Man - Hiruchameleon - Zu-Gooma-Gu - Go-Jaraji-Da - Volucris Falco - Solospider - Scorpion Orphnoch - Titan Undead - Kodama - Sectio Worm Acuere - Cobra Imagin - Gecko Imagin - Sungazer Fangire
Super Shocker Combatmen
World of Kuuga: Me-Gyarido-Gi - Ra-Dorudo-Gu - Go-Baberu-Da - Go-Bemiu-Gi - Me-Biran-Gi - Go-Jaaza-Gi - Me-Garima-Ba
World of Agito: Me-Badjisu-Ba - Zu-Mebio-Da - Me-Ginoga-De
The Lords
Taurus Ballista
Formica Regia - Formica Pedes
Mirror Monsters
The Contract Monsters
World of Ryuki: Darkwing - Volcancer - Destwilder - Gigazelle - Abyssodon (Abysshammer - Abysslasher)
World of Negatives: Dragblacker
Wild Mirror Monsters
World of Ryuki: GuldThunder - Zebraskull Bronze - Megazelle - Negazelle - Omegazelle - Magazelle
World of Den-O: Gelnewt
World of Negatives: Raydragoons
Orphnochs / Lucky Clover
Momose - Shukawa - Genda - Shirogane
Butterfly Orphnoch
The Undead
World of Blade: Kamata - Hajime Shijo
Buffalo Undead - Elephant Undead - Capricorn Undead
World of Diend: Fourteen - Bossroach - Darkroaches
World of the Rider War: Deer Undead - Scarab Undead - Lizard Undead
魔化魍 Makamou
Gyuki - Bakegani
Kappa - Bakeneko - Ooari - Tengu - Ubume
Sou Otogiri
Coleoptera Worm Argentum - Geophilid Worm - Subst Worm
The Imagin
Alligator Imagin - New Mole Imagin
The Fangires
Beetle Fangire - Yuki
World of Kiva: Ryo Itoya - Swallowtail Fangire - Lion Fangire
World of the Rider War: Shark Fangire - Silkmoth Fangire - Horsefly Fangire - Warthog Fangire
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