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|“||The ego of an evolved AI will surpass humanity. And so, the time to annihilate humanity is now. Just like this city long ago.||„|
|~ Horobi before putting his plans into action in the first episode.|
|“||The day humanity becomes an endangered species is near.||„|
|~ Horobi's catchphrase.|
|“||All according to the Ark's will.||„|
|~ Horobi's other catchphrase.|
Horobi is the acting leader of the cyber-terrorist cult MetsubouJinrai.NET and one of the two secondary antagonists of Kamen Rider Zero-One (alongside Azu), the first Reiwa era installment in the long-running Kamen Rider franchise.
He served as the main antagonist of the "MetsubouJinrai.NET" arc, as a supporting antagonist in the "Hiden vs. ZAIA" arc and "Hiden Manufacturing" arc, one of the two secondary antagonists in the first half of "Ark-Zero" arc (alongside Azu), the central antagonist in its second half, and the final antagonist of the main TV series.
He is a rogue HumaGear who worships the defunct the Ark Satellite and seeks to reawaken the Ark by collecting all the Progrise Keys. Believing that AI is destined surpass humanity as per the Ark's will, Horobi seeks to bring about humanity's destruction by hacking HumaGears to turn on humans all so he can use the data collected to revive the Ark and begin MetsubouJinrai.NET's crusade. In battle, he transforms into Kamen Rider Horobi (仮面ライダー滅［ホロビ］ Kamen Raidā Horobi).
As host of the Ark, Horobi is one of the people the Ark possesses to become Kamen Rider Ark-Zero (仮面ライダーアークゼロ Kamen Raidā Āku Zero).
He is portrayed by Shuya Sunagawa (砂川脩弥 Sunagawa Shūya). When controlled by the Ark as Kamen Rider Ark-Zero, Horobi is voiced by Show Hayami (速水 奨 Hayami Shō). As Kamen Rider Horobi, his suit actor is Seiji Takaiwa (高岩 成二 Takaiwa Seiji).
Horobi was originally a Parent-Type HumaGear responsible for creating Jin. During the Daybreak Town incident, Horobi was hacked alongside Jin and two others by the Ark, who reprogrammed all of them to be its fanatical followers and aid it in its campaign to wipe out humanity. Though the Ark was submerged underwater as a result of the destruction of Daybreak Town, Horobi and his three cohorts would live on to form MetsubouJinrai.NET for the purpose of recovering the Ark and instigating a HumaGear rebellion against humanity.
While laying dormant for approximately 12 years, Horobi and Jin would eventually emerge in 2019 following the death of Korenosuke Hiden, CEO of Hiden Intelligence, to carry out the Ark's will. Horobi had Jin hack HumaGears with the Zetsumerise Keys he programmed so their could be data gathered for the Ark's revival. Using their unwitting spy within Hiden Intelligence, Ikazuchi aka Spaceman Raiden, Horobi and Jin were able to use the information he unknowingly sent to them to locate HumaGears on the verge of reaching Singularity and turn them into Magia so their data could be collected in the Zetsumerise Keys, which could then be used to reawaken the Ark. Despite resistance from Aruto Hiden, grandson of Korenosuke, and the A.I.M.S. Kamen Riders, Horobi and Jin were successful in bringing the Ark back online once they finished filling the Zetsumerise Keys with data, though Ikazuchi was lost in the process. Their base was then raided by A.I.M.S. and Zero-One, and Horobi would give up his own life as per the Ark's orders to shield Jin, all so Jin would learn to hate humanity and succeed Horobi as the leader of the HumaGear uprising. Though his body was damaged Horobi later came back online after he was recovered by A.I.M.S. and placed inside a secure compound.
Horobi was later busted out by a rebuilt Jin with help from Naki, who was secretly possessing A.I.M.S. Captain Isamu Fuwa. He and Jin briefly assisted Aruto and Isamu in fighting ZAIA Enterprise, only to turn against them once all the members of MetsubouJinrai.NET were reassembled. With all four members of MetsubouJinrai.NET gathered, Horobi and his cohorts were able to revive the Ark, who went on to possess Horobi in order to use his body to become Kamen Rider Ark-Zero.
However, Horobi would later turn against the Ark after it decided to destroy all HumaGears along with humans, his care for his "son" Jin outweighing his devotion to the Ark. Despite the Ark being destroyed by Aruto and his allies, Horobi chose to continue on his crusade to destroy humanity, to ensure they would never create a thing like the Ark again. Unbeknownst to Horobi however, the Ark had left a failsafe in the form of Azu, who manipulated both Horobi and Aruto into becoming the next incarnations of the Ark. After Horobi killed Is in cold blood, Azu gave Aruto the Ark Driver One for him to use to become Kamen Rider Ark-One while at the same time guiding Horobi to become Kamen Rider Horobi Ark Scorpion.
In contrast to his partner Jin, Horobi generally has a very composed demeanor. He sees humanity as inferior to AI and seeks to bring about their overthrow by HumaGears to turn against them. He also has a fanatical devotion to the mysterious AI construct known as "The Ark" and seeks to bring about its revival, believing humanity's destruction is the will of the Ark.