Metalgelas (Ryuki)

Metalgelas appeared in 2002 TV series called Kamen Rider Ryuki. Metalgelas (メタルゲラス Metarugerasu) is a Mirror Monster that was originally contracted to Kamen Rider Gai but was later contracted to Kamen Rider Ouja. This makes him one of 5 Mirror Monsters that had more than 1 contractor. Together with Venosnaker and Evildiver, it became one of the building blocks of the composite Monster Genocider.

Metalgelas appears initially as Gai's Contract Monster but after Jun is killed, Asakura contracts him. Metalgelas resembles a humanoid rhinoceros and can reach extremely high speeds. He also has tough skin that can crush a moving car.

Metalgelas originally assisted Jun in both destroying monsters and attacking other Riders. However, once Jun died at the hands of Asakura, Metalgelas attacked many people whom it believed resembled Asakura (as it was trying to avenge its contractor). However, Asakura was able to successfully contract Metalgelas and after Asakura obtained Evildiver as well, he was able to merge Metalgelas with Evildiver and Venosnaker to create Genocider.

Metalgelas began to once again turn on Asakura after he neglected to feed it life-force energy from Mirror Monsters. In defiance, he attacked Asakura once before finally being fed just before Asakura completely breached his contract.

As Asakura didn't die at the hands of a Rider, it's not known what happened to Metalgelas. However, the End implies that because the Rider War was made non-existent, Metalgelas was also made non-existent.

Metalgelas makes a brief appearance in the film. He appeared when Asakura used his Unite Vent card to combine Metalgelas with Evildiver and Venosnaker into Genocider. Metalgelas was also destroyed alongside Evildiver and Venosnaker when they were hit by Kamen Rider Ryuga's Final Vent.

Metalgelas was also one of the kaijin who gather at Eiji Hino, Kotaro Nogami and Ankh/Momotaros's public execution. However, when all Kamen Riders return to existence, Metalgelas tries to attack them although it is foiled by Kamen Rider Black RX.

Uses

 * Strike Vent: Metalgelas's horn becomes the Metal Horn gauntlet.
 * Heavy Pressure (Final Vent): Metalgelas also allows Gai and later Ouja to ride it during a Final Vent in which it pierces the opponent with both the rider himself and its horn.