Hans Rattan

This Kamen Rider Onyx was a Dark Rider who murdered and assumed the guise of the Dark Rider World counterpart of Hans Rattan, Summer's SDO (School Drop Out) Club high school classmate. He was destroyed by Chrono Warrior Complete Form with the Dragon Survive Survive Final Kamen Ride.

Earlier, in the World of Phi, Kaleo summoned a version of Onyx to finish off Chrono Warrior, who at the time was Onyx to transform. This one was defeated by Past Caller using the Vampire King Bolt.

Kamen Rider Onyx
Ability Parameters: A black-colored version of Dragon Knight contracted to Dragblacker, Onyx possesses the same abilities and combat potential as the former; however, Onyx is relatively stronger than Dragon Knight, due to his Advent Cards having a higher AP. The only disadvantage of the Onyx form is the lack of a Survive Mode card. His Visor, the Black Drag Visor is equipped on his left arm. Like Dragon Knight, Onyx's parameters are balanced. However, they are heightened to the point where Onyx is the strongest out of all of the 13 Riders.
 * Rider Height: 190 cm
 * Rider Weight: 90 kg
 * Punching Power: 250 AP (12.5 t)
 * Kicking Power: 450 AP (22.5 t)
 * Maximum Jump Height: 40 m
 * Maximum Running Speed: 100 m per 4.5 seconds

Equipment

 * Advent Deck - Transformation device and Advent Card holder
 * Advent Belt - Transformation belt
 * Advent Cards - Trinkets that enable a Rider to summon Contract Monsters, access equipment, and use special abilities
 * Black Drag Visor - Onyx's Visor that enables him to use Advent Cards