Hideyuki Kagawa/World of If

In the alternate ending, World of If, Hideyuki Kagawa (香川 英行) was Alternative Zero (オルタナティブ・ゼロ), an imitation of the 13 Riders.

World of If
Yui is seeking out her brother when she is confronted by Alternative Zero and 12 Alternatives. Alternative Zero recognizes her as the unwilling cause of the war, and tries to kill her, but Shinji sacrifices himself to save her. Alternative Zero can’t believe a Rider would act selflessly and Yui asks him for something.

Alternative Zero
Alternative Zero Rider Statistics Rider Senses: Ability Parameters: Special Attacks:
 * Rider Height: 190 cm.
 * Rider Weight: 93 kg.
 * Eyesight: 20 km.
 * Hearing: 15 km.
 * Punching Power: 300 AP (15 t.)
 * Kicking Power: 450 AP (22.5 t.)
 * Maximum Jump Height: 50 m.
 * Maximum Running Speed: 100 m. per 4.5 sec.
 * Slash Dagger: 2000 AP (100 t.)
 * Accelerated Attacks: 2500 AP (125 t.)
 * Psycoroader: 4500 AP (225 t.)
 * Dead End: 8000 AP (400 t.)
 * Advent: Psycorogue: 6500 AP (325 t.)

Kagawa transforms into Alternative Zero using his version of the Advent Deck and V-Buckle. Alternative Zero is the prototype model of Alternative, a mimicry of the 13 Riders created by Kagawa using Shiro Kanzaki's notes on the Mirror World. The completed version of Alternative is used by Hajime Shijo. Both versions are identical with the exception of the color of the tubes on the shoulders and Alternative Zero being shorter and lighter. Although it is unclear if the two are contracted in the same way as the 13 Riders and their Contract Monsters, the Mirror Monster Psycorogue can be summoned by Alternative Zero and follows his commands. Alternative Zero's Visor, the Slash Visor, is a gauntlet mounted on his right arm.

Through the use of his Sword Vent, Alternative Zero can arm himself with the Slash Dagger (スラッシュダッガー), a sword derived from Psycorogue's forearms. By using the Wheel Vent, Alternative Zero can transform Psycorogue into motorcycle mode named the Psycoroader (サイコローダー) for him to ride.

By using his Final Vent, Alternative Zero can execute his finisher, the Dead End (デッドエンド), which transforms Psycorogue into the Psycoroader if it has not done so already. Alternative Zero then rides the Psycoroader toward the opponent and rams into it.

Appearances: ''World of If

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
 * Slash Visor - Alternative Zero's Visor that enables him to use Advent Cards

Vehicles

 * Psycoroader - Serves as Alternative Zero's motorcycle