Psycorogue is a Mirror Monster contracted to the Alternatives and an antagonist in Kamen Rider Ryuki.
Kamen Rider Ryuki
Psycorogue outlived it's masters before being finished out when it was weakened by Ryuki's Drag Claw Fire and then destroyed by Knight's Hishou Zan.
Kamen Rider Decade
Psycorogue was one of the revived monsters who were part of the massive Dai-Shocker army stationed in the World of Decade, as seen in All Riders Vs. Dai-Shocker. The army launched an invasion of the multiverse, only to be met with a gathering of 25 Kamen Riders who came together to combat Dai-Shocker's invasion.
Psycorogue is a Mirror Monster that resembles a humanoid cricket. This contract monster has white armor with black accents while Alternative's armor was black and Alternative Zero's was black with white accents, contrary to other Riders whose armor were similar with their contract monster.
Psycorogue could transform into a motorcycle called the Psycoroader. The Final Vent move Dead End transforms Psycorogue into a motorcycle then an Alternative and motorcycle spin-out faster and faster until they ram into the opponent.