Yuto Sakurai/Outsiders

is a man from a dark alternate timeline who transforms into . 
Like his original timeline counterpart, he was also in the past but did not fight for love.
==History==
===Background===
This version of Yuto Sakurai comes from a post-apocalyptic future where he lost the people he cared about, though the fates of his Airi Nogami and Deneb (if they even existed) were never elaborated upon. Because humanity in his future have lost control, he was summoned into the present day by Zein and was chosen to be its vessel and user of the Zein Driver to transform into Kamen Rider Zein in hopes of subjugating mankind.
===Becoming Zein===
In Sakuya Tachibana's office, Yuto enters to receive the Zein Driver while Horobi is ambushed by a revived Tenjuro Banno. Just as Horobi was about to be finished by Bronzedrive, Yuto transforms into Zein and somehow stopped time, immobilizing Banno as he invokes Muteki Gamer's Hyper Critical Sparking, beating the psychopathic scientist within an inch of his life. Fearing for his life, Banno attempts to escape, only for Zein to use the Haouken Xross Saber to launch the 10 Seikens at him, destroying his Humagear body in the process. 
After the battle, Yuto reveals himself as Kamen Rider Zein, with Foundation X agent Ecole having recognized him as Kamen Rider Zeronos. Former Roidmude commander Brain befriends Yuto and follows him to BOARD, which allows Brain and Banno, who survived the brutal beating from Zein, to spy on Zein's inner circle; where they finally learn of Zein's master plan: relaunch Kamen Rider Chronicle to recruit Ride Players in hopes of eliminating malice. In truth, this is a pretext for Zein's goal of using the game to send mankind towards the path of self-destruction. When Nico Saiba objects to this plan, she is held at gunpoint by Tachibana, leading to Horobi immediately falling out with his fellow heroic Riders. Yuto reveals that Horobi choosing not to annihilate humanity was the cause of his dark future. Tensions rise even further when the Ark possesses Horobi, transforming into Ark-Zero and easily overpowered Kamen Rider Garren. However, Yuto would personally confront the Ark and transforms into Kamen Rider Zein. Zein viciously dominates Ark-Zero as he prepares to use Blade King Form's powers. However, Kamen Rider Brain takes the deathblow meant for Ark-Zero, as the Roidmude calls him out for his brutal and callous behavior knowing that if he kills Horobi, along with the Ark will not excuse him from becoming the same kind of evil he's opposing. This causes Yuto to relent and de-transform. However, Garren unlocks his own King Form and destroys the weakened Ark-Zero with his Four of a Kind finisher, injuring Horobi. In the aftermath, Zein hijacks Yuto's body and introduced itself to its now-former allies, Zein then mimics Nico's voice as it tricks Genm Corp. CEO Tsukuru Koboshi into relaunching Kamen Rider Chronicle while Horobi, Brain, and Tachibana can only look on in horror as Zein proceeds with its plan into motion. 
==Personality==
This Yuto Sakurai is a gloomy, nihilistic, and sullen individual; a far cry from the fiery temper and heart of gold of his prime counterpart. Given that he came from a post-apocalyptic future where he lost everything, he became misanthropic and believed that humanity is a lost cause because of their capacity for malice that he willingly accepted himself as Zein's host to become the namesake Kamen Rider, using the power of every Kamen Rider so that Zein can rule the world with an iron fist.
As Kamen Rider Zein, Yuto is shown to be very cold-blooded and violent. He shows no remorse in turning Tenjuro Banno into a human pincushion using Xross Saber's powers. Shockingly, this Yuto is more willing to cross the line for the sake of a greater good when most heroic Riders are not supposed to. Had Brain not protected Horobi (while possessed by the Ark) from Zein's killing blow, Yuto could have become the same kind of monster he is fighting. Even though Brain managed to save Yuto from going down further to a dark path, this is unfortunately cut short when Zein possesses Yuto, preventing him from truly redeeming himself.
==Forms==
==Equipment==
===Devices===
*Zein Driver - Transformation device as Kamen Rider Zein
*Progrisekeys - Transformation trinkets as Kamen Rider Zein
*Zein Cards - Secondary trinkets as Kamen Rider Zein
*Rouse Cards - Cards summoned via the Blade King Form Zein Card
===Weapons===
*Haouken Xross Saber - Sword summoned via the Xross Saber Zein Card
*King Rouzer - Sword summoned via the Blade King Form Zein Card
*SB-555T Faiz Blaster - Weapon summoned via the Faiz Blaster Form Zein Card
*Revicelasher - Sword summoned via the Ultimate Revi Zein Card
*Perfect Zecter - Sword summoned via the Kabuto Hyper Form Zein Card
*Geats Buster QB9 - Sword summoned via the GeatsIX Zein Card
==Legend Rider Devices==
==Behind the Scenes==
===Portrayal===
Like his main counterpart, this Yuto Sakurai is also portrayed by . When possessed by Zein, he is voiced by and .
As Kamen Rider Zein, his suit actor is .
==Notes==
to be added
==Appearances==
==Navigation==
Category:Antiheroes
Category:Outsiders Characters
Category:Outsiders Riders
Category:Card Riders
Category:Special-exclusive Characters
Category:Special-exclusive Riders
Category:Good turns evil
Category:Antivillains
Category:Future Riders