Shinji Kido/13 Riders

In an alternate retelling of the series, Shinji Kido (城戸 真司) is an employee at ORE Journal, whose life takes a sharp turn after being pulled into the Mirror World by a Mispider. Luckily, he was saved by Koichi Sakakibara, the latter could no longer go on due to the severity of his injuries and passed his Card Deck to Shinji, allowing him to become the next Kamen Rider Ryuki (仮面ライダー龍騎).

Eventually, Shinji's deck is destroyed and Ren Akiyama passed on the Knight Deck, becoming Kamen Rider Knight (仮面ライダーナイト)

13 Riders
In the 13 Riders Special which is also an alternate retelling of the story, his role in the Rider War was the same, but his origin as Ryuki was much different. It was by fate he was dragged into Mirror World by a monster to be saved by the previous Ryuki, Kōichi Sakakibara. But mortally wounded and wishing to save his life, Sakakibara gave Shinji his deck and faded while Shinji became the new Kamen Rider Ryuki.

Shinji still tried to prevent the other Riders from fighting as his way to thank Sakakibara. He was lured into the Mirror World by the others under the guise of a truce, but was ambushed. While fighting the other Riders, the Ryuki deck was destroyed by Kamen Rider Odin. After Ren was killed by Kamen Rider Verde, Ren gave Shinji the Knight deck and he took the mantle of Kamen Rider Knight. Shinji promised Ren that he will fight and in one ending he takes on the rest of the other Riders.

In the other ending, Shinji destroyed the master mirror with the monsters and Riders fading away only for the Riders to reappear and Shinji regaining the Ryuki deck. Confused, he screams when he heard Takamizawa's voice saying that the Rider Fight will not end.

Forms
Shinji transforms into Kamen Rider Ryuki through his Advent Deck and his V-Buckle. Throughout the main series run, he only transformed into Ryuki.

In an alternative retelling of Kamen Rider Ryuki, Kamen Rider Ryuki Special: 13 Riders, Shinji's deck is destroyed and Ren dies after passing on the deck for Kamen Rider Knight to Shinji. Shinji then transforms into Kamen Rider Knight with Survive Mode.

Equipment

 * Advent Deck - Transformation device and Advent Card holder
 * V-Buckle - Transformation belt
 * Advent Cards - Trinkets that enable a Rider to summon Contract Monsters, access equipment, and use special abilities
 * Drag Visor - Ryuki's Visor that enables him to use Advent Cards
 * Drag Visor-Zwei - Upgraded version of the Drag Visor used to transform into Ryuki Survive
 * Dark Visor - Knight's Visor that enables him to use Advent Cards
 * Dark Visor-Zwei - Upgraded version of the Dark Visor used to transform into Knight Survive

Vehicles

 * Ride Shooter - Motorcycle used by any Rider to enter the Mirror World
 * Dragranzer Bike Mode - Serves as Ryuki Survive's bike
 * Darkraider Bike Mode - Serves as Knight Survive's bike

Relationship
To be added.

Portrayal
Shinji Kido is portrayed by Takamasa Suga (須賀 貴匡). As Kamen Rider Ryuki, his suit actor was Seiji Takaiwa (高岩 成二), who has been the suit actor for the majority of leading Heisei Kamen Riders (except Kuuga and Hibiki).

Appearances

 * Icon-ryuuki.png Kamen Rider Ryuki
 * Icon-ryuuki.png Kamen Rider Ryuki Special: 13 Riders