Uchuyaro Raiden

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 was an Astronaut-Type Humagear member of MetsubouJinrai.net who transformed into , while acting as a sleeper agent within Hiden Intelligence as . He was possessed by the Ark as the third , and later by the Massbrain System as .
==History==
===Background===
Uchuyaro Raiden was an Astronaut-Type Humagear created to maintain Ark, but was placed in stasis after Soreo Hiden prevented the launch from occurring. During the Daybreak Town Accident, Raiden was among the Humagears alongside Horobi, Jin, and Naki who were compromised by Ark to form MetsubouJinrai.net, with secret protocols installed to serve as the group's sleeper agent known as Ikazuchi. When There successfully launched, Raiden was reactivated to maintain the satellite with Uchuyaro Subaru, but unknowingly began leaking Zea's data back to MetsubouJinrai.
===Calling Down The Thunder===
After Aruto Hiden recklessly summoned the Rise Hopper just as he and Subaru had just returned it back to space, the brothers return back to Earth to confront the president. Raiden took Aruto to the Hiden Space Development Center so he could appreciate the brothers' efforts. They were approached by Isamu Fuwa and Yua Yaiba, where Raiden is accused of being a MetsubouJinrai spy. When Jin arrived to take the Progrisekeys, Raiden protected Subaru from harm. While he assisted Aruto and Fuwa to locate of MetsubouJinrai's hideout in Daybreak Town, Jin arrived and revealed Raiden's true nature as a sleeper agent "Ikazuchi". Jin used the MetsuboJinrai ForceRiser to awaken Raiden's dormant programing, allowing him to become Kamen Rider Ikazuchi. He used his connection with Zea to reactivate the Ark. Despite initially besting Zero-One and Vulcan in battle, Ikazuchi was completely destroyed by Vulcan Assault Wolf.
===The Lightning Revival===
After his destruction, Uchuyaro Raiden's Humagear Progrisekey was left in Aruto Hiden's possession. When Horobi abducted the farmer Humagear Midori and used her a hostage to obtain Ikazuchi's data. Jin manages to recover the Progrisekey from Aruto when Zero-One fought Kamen Rider Horobi. After returning to the MetsubouJinrai hideout after dealing with Thouser's forces, Ikazuchi's data was successfully reuploaded into a new Humagear body and he was fully revived. As a result, the four members of MetsubouJinrai.net would have reassembled at last.
===The Ark Uprising===
MetsubouJinrai would accomplish their goal in completely reviving the Ark, having evolved into Kamen Rider Ark-Zero. Ikazuchi would reclaim the Dodo Zetsumerisekey from Gai Amatsu with Naki's assistance, allowing him to become a Kamen Rider once more. Ikazuchi and the rest of MetsubouJinrai.net were met by a massive army of A.I.M.S. soldiers, all rendered unconscious by Ark-Zero. Ikazuchi joined with Horobi and Naki in facing against Thouser, before he was decisively beaten by Ark.
As Ark-Zero sought to gain access with There, Ikazuchi accompanied his master to Hiden Intelligence's space center. As they advanced on, Ikazuchi develops had flashbacks of Subaru and regain his memories from his time as Uchuyaro Raiden. He decides to meet with Aruto at HIDEN Manufacturing to assist in fighting Ark. Despite Jin's skepticism, this was revealed to be Ark's plan to lure the president in order to claim the Zero-One Driver. Ikazuchi becomes the third host of Kamen Rider Ark-Zero and is used to connect and hijack There, becoming more invincible than ever.
Through the innovation of Kamen Rider Zero-Two, Aruto Hiden manages to outperform against Ark-Zero in his first battle and free Ikazuchi. Before Jin could take him to safety, Horobi came into the scene and took his unconscious body back to MetsubouJinrai. Jin returns to the hideout and manages to convince Ikazuchi to give up on his crusade against humanity, as the Ark doesn't have their best interests at heart. After reuniting with his brother Subaru, Ikazuchi flew into space to destroy Ark using the Breaking Mammoth, ensuring the A.I.'s full destruction.
Despite the threat of the Ark was apparently over, Horobi continued his crusade to destroy humanity. His comrade's actions drove to the death of Is and the Aruto Hiden's downfall to become Kamen Rider Ark-One. Learning of Jin's destruction at the hands of Ark-One, Ikazuchi begs Horobi to not pursue revenge as this isn't what Jin would've wanted and how he was the biggest heart of all Humagears. But he couldn't comment any further after Horobi asks the possibility of Suburu's death. While Ikazuchi watched the final battle between Aruto and Horobi, it ending with the two finding peace with each other. Following this final victory, Ikazuchi resumes his old duties as Uchuyaro Raiden once more.
===Kamen Rider Zero-One: REAL×TIME===
Three months after the threat of the Ark had subsided, a new incarnation of the Ark arises with the presence of Rihito Isshiki (S) who embarks to destroy the world and replace it with a "paradise". Raiden resumed working at the Hiden Intelligence space center as an Astronaut Humagear. Since There is no longer in orbit, Raiden continued to operate on Earth for the time being. After Aruto called for the Rise Hopper, Raiden personally delivered the bike after being called ten minutes ahead of time by Zea.
===Zero-One Others===
Sometime after the Thinknet crisis, Raiden remained on Earth while his brother Subaru and the other Astronaut Humagears were in space to prepare the launch of Satellite We're. He reunited with his teammates at at MetsubouJinrai.net and resumed acting as "Ikazuchi" after ZAIA had captured Jin. Upon learning of Arkland's goal of weaponizing Humagears for military purposes as part of his "Sold Project", Ikazuchi merged with his teammates to become Kamen Rider MetsubouJinrai, but at a risk of losing their own will. Ultimately, Ikazuchi and the rest of his teammates made the sacrifice to fuse once more in order to free the Sold Humagear from the Massbrain System's influence. This came at the cost of losing his free will as Ikazuchi could not do anything as they murder Arkland, destroyed their Humagear bodies of MetsubouJinrai.net, and annihilated the ZAIA Japan HQ building.
During the aftermath of the ZAIA HQ destruction, Kamen Rider MetsubouJinrai continued to pursue Yua Yaiba. This is due to the influence of Ikazuchi, Horobi, Jin, and Naki, who are begging to be destroyed by the Kamen Riders to end their suffering. Although Valkyrie Justice Serval managed to damage the MetsubouJinrai Driver's power unit, it still wasn't enough to defeat the runaway Rider. Once Isamu Fuwa transformed into Vulcan Lone Wolf, he managed to vanquish Kamen Rider MetsubouJinrai, vaporizing Ikazuchi and the other members of MetsubouJinrai.net in the process.
Despite the demise of Ikazuchi and the rest of his teammates, their goal of freeing the Solds and release from the Massbrain System's influence.
==Video Game Appearances==
===Kamen Rider Battle: Ganbarizing===
Kamen Rider Ikazuchi is a playable character in Kamen Rider Battle: Ganbarizing alongside with many other Kamen Riders.
===Kamen Rider Buttobasoul===
Kamen Rider Ikazuchi is a playable character with other Kamen Riders of Showa, Heisei, and Reiwa in Kamen Rider Buttobasoul.
===Battle Spirits ===
Kamen Rider Ikazuchi appear with other Kamen Riders and Monsters in Battle Spirits.
Ikazuchi Battle Spirits Cards Included
*Kamen Rider Ikazuchi (Common)
*Kamen Rider MetsubouJinrai (Rare)
===Zenonzard===
As part of Kamen Rider's collaboration with Zenonzard, cards from Zero-One, OOO, and W were available in the Japanese servers throughout September 2020. 
*Ikazuchi Cards Included
**Kamen Rider Ikazuchi Dodo (Comun)
==Personality==
Ikazuchi is a Humagear with an aggressive and passionate personality, mainly because he reached Singularity. He shows immense care for his current model brother Subaru, even willing to risk his life to shield Subaru from Jin's hacking tendrils. Like the other members of the terrorist group, his programming was compromised by the Ark during the Daybreak Town Accident, but continued to function normally because he was a sleeper agent. His old personality would return only after the Ark restored his memory as a part of its plans.
When MetsubouJinrai.net was ready to enact their plan to awaken the Ark, Jin activated his corrupted programming by using a Forceriser. As a result of this corruption, Ikazuchi became a cruel Humagear with full-fledged loyalty towards Ark, and his new goal to bring humanity to extinction made him forget everything about Subaru. This nature was retained after he was revived, but was lost after Ikazuchi permanently regained his original memory.
==Powers==
*Electricity Discharge: True to his name, Ikazuchi possesses the ability to discharge red-colored lightning. He can do this outside of his Rider form, and is even able to spread the lightning to the entirety of Daybreak Town. When this happens, his eyes will glow light red.
*Connection with Zea: Due to his position as supervisor of Zea, Ikazuchi has the unique ability to control communications devices, including Zea itself. It was because of this ability that he was used by MetsubouJinrai.net to reactivate the Ark and create the Assault Wolf Progrisekey. This ability was also exploited by Ark-Zero after possessing Ikazuchi and obtaining the Zero-One Driver to forcefully connect itself to Zea and hijack it.
==Forms==
==Equipment==
===Devices===
*MetsubouJinrai Forceriser - Transformation device.
*Zetsumerisekeys - Transformation trinkets
*Progrisekeys
*Progrise Holder - Holders for carrying Progrisekeys. Ikazuchi was once equipped with eight Progrise Holders instead of the usual two.
*Ark Driver-Zero - Second transformation device as Ark-Zero
===Weapons===
*Buaruku Sabers - Ikazuchi's personal weapons using the Dodo Zetsumerisekey
*Attache Shotgun - Secondary weapon, once used by Jin
===Vehicles===
*Breaking Mammoth Jet Form - Temporary Vehicle
==Relationships==
===Family===
Subaru Profile.jpg|Uchuyaro Subaru - "Younger Brother"
* Subaru: Subaru is Ikazuchi's brother and fellow Astronaut-Type Humagear. Before Ikazuchi's awakening, they both had a very good relationship, with Ikazuchi even ready to risk his 'life' for him. Ikazuchi lost his affection towards Subaru after his original memory was sacrificed, but regained it after his memory's restoration and later help Ikazuchi destroy Ark once for all.
===Friends/Allies===
* Aruto Hiden/Kamen Rider Zero-One: Ikazuchi was initially upset from Aruto because of his reckless usage of Rise Hopper, but he apparently forgave him. Whenever Ikazuchi operated with his original memory, he tried to help him against the Ark, but was turned against him after corruption. After understanding that Ark had exploited him, he decided to reunite with Subaru and thus helped destroy Ark by using Breaking Mammoth. During the Thinknet incident, he assisted Aruto by personally delivering his Rise Hopper to the latter's location right after being informed by Zea, which shows their relationship on good terms.
* Is/Kamen Rider Zero-Two: to be added
* Isamu Fuwa/Kamen Rider Vulcan: Isamu didn't get along with Ikazuchi as Raiden as he still holds enmity towards Humagears. But all events between them had changed since then.
* Yua Yaiba/Kamen Rider Valkyrie: to be added
* Gai Amatsu/Kamen Rider Thouser: to be added
* MetsubouJinrai.net
**(Kamen Rider) Horobi: The leader of MetsubouJinrai.net. It was Horobi who obtained Ikazuchi's Progrisekey from Aruto in order to revive him. After being revived and later leaving the group to destroy Ark, he still maintains a bond to Horobi and his fellow comrades. Especially after Jin was sacrificed by Aruto controlled by Ark, when questioning Ikazuchi if Subaru died in front of him.
**(Kamen Rider) Naki: They were both founding members of MetsubouJinrai.net. When Naki was damaged by the arrival of the Ark, Ikazuchi went to their side and helped repair them.
**(Kamen Rider) Jin: Jin was the one who brought Ikazuchi into his corrupted protocol in the present day. After Ikazuchi was destroyed by Vulcan, Jin was extremely saddened as he made a grave for him and Little Assassin. Ikazuchi's death was also the initial motivation for Jin to destroy humanity. After both Jin and Ikazuchi regained their memories, they together tried to help Aruto in defeating Ark, although this attempt failed.
===Enemies===
*Ark: MetsubouJinrai.net's former master.
*Lyon Arkland/Kamen Rider Zaia: to be added
==Behind the Scenes==
===Portrayal===
Uchuyaro Raiden/Ikazuchi is portrayed by , who previously portrayed Kimura in Rider Time: Kamen Rider Ryuki. This makes Daichi the first actor in the Kamen Rider Series to performed the roles of two different Riders from different series and eras within the same year. As Kamen Rider Ikazuchi, his suit actor is . Kanzaki is also the suit actor for Kamen Rider Ark-Zero under the conditions that Ikazuchi is the one being possessed.
===Etymology===
Ikazuchi means and the fourth syllable of MetsubouJinrai. The name reflects Uchuyaro Raiden's catchphrase of "calling down the thunder", as well as Ikazuchi's electrokinetic abilities.
*Furthermore, the first syllable in Raiden's name is the same kanji for Ikazuchi (雷), which foreshadowed his true nature as a MetsubouJinrai sleeper agent.
===Concept Art===
Kamen Rider Ikazuchi Concept Art.png|Kamen Rider Ikazuchi concept art
==Notes==
*The name means "thunder and lightning".
**The first kanji of his name is the fourth character in , foreshadowing his role as their sleeper agent.
**When read as the Kun'yomi-style like Horobi instead of the On'yomi-style , it also becomes the name of his Rider identity.
* The first two syllables in his & Subaru's last name (Uchu) mean "Space", "Universe" (宇宙), which refers to their jobs as Astronaut-Type Humagears.
*Both Ikazuchi and Subaru wear the same orange space suits are recycled from the space suits in Kamen Rider Fourze The Movie: Everyone! Let's Feel the Universe!, with different patches and no belt.
*Ikazuchi's suit has similar parts from Kamen Rider ZeroZero-One, except with the undersuit of Blood Stalk, additional arm fins from Night Rogue, and a new helmet.
*Ikazuchi's transformation pose traces a lightning bolt symbol.
*Ikazuchi using the SpaceComing Fourze Progrisekey in Kamen Rider Battle: Ganbarizing reflects Ikazuchi's occupation as an astronaut, which is also Fourze's motif/theme.
*Azu's result of Ikazuchi's singularity test is as follows:
**He stands at 172 cm, making him a little shorter than his actor.
**His Humagear No. is 0223.
***The last two digits could be pun on the word "Older Brother": , referencing his relation to Uchuyaro Subaru.
**His operating system is MBJR003, making him the third member of MetsubouJinrai.net.
==Appearances==
 
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