Kyoichiro Kuroi

Kyoichiro Kuroi is Kamen Rider 3, the third Kamen Rider created by Shocker and a major antagonist in Super Hero Taisen GP: Kamen Rider 3 as well as the Shuriken Sentai Ninninger Vs. Kamen Rider Drive Spring Vacation One-Hour Combining Special.

Origin
Kamen Rider 3 was created due to Roidmude 089 using the History Modifying Machine to alter the past. Kyoichiro Kuroi was originally an F-1 Racer with a failed career who was taken in by Shocker and converted into Kamen Rider 3, the third Kamen Rider.

Shuriken Sentai Ninninger Vs. Kamen Rider Drive Spring Vacation One-Hour Combining Special
Kamen Rider 3 attacked Kamen Rider Mach and beat him down, but spared him as he stated that Go was not the one he was after. After Roidmude 089 was killed, Kamen Rider 3 opened his helmet and stated that the Roidmude was only a prototype of the History Modifying Machine and that Shocker's true plan was about to start.

Super Hero Taisen GP: Kamen Rider 3
Kamen Rider 3 was sent back in time by Shocker to the year 1973. He appeared right after the Double Riders defeated the Great Leader of Gel-Shocker and defeated both riders, allowing to Shocker rise again and changing the course of history itself.