Kyoichiro Kuroi (Taki Gaiden)

This Kuroi Kyoichirō (黒井 響一郎) from his own alternate universe transforms into Kamen Raidā Sangō (仮面ライダー3号), sent by to assist  and Taki in the event he loses his Rider powers.

History
This A.R. Kyoichiro's backstory is similar to his : In the past, he was abducted by and modified him into their own Rider. However, Kyoichiro is rescued by and ever since opposed the evil organization. After Tsukasa's ordeal with the nine A.R. Worlds and during the events of Taki Gaiden and Kamen Rider Zi-O, Kyoichiro is called by Tsukasa to make his way into the to make contact with  and Taki in case if something happens to him.

Kamen Rider 3
Kamen Rider 3 Ability Perimeters
 * Height: 179.0cm
 * Weight: 74kg
 * Punching Power: 15.0t
 * Kicking Power: 24.0t
 * Maximum Jump Height: 50.0m

Portrayal
Being Kyoichiro of an alternate continuity, he is portrayed by Oikawa Mitsuhiro (及川光博).