Adam (Dragon Knight)

Adam was Kamen Rider Dragon Knight, and Kit's Ventaran counterpart, who had "betrayed" the other Kamen Riders by venting them into the Advent Void (save for Kase and Len) into helping Xaviax take over Ventara so he can be with his girlfriend, Sara. Adam wanted to retire from being a Kamen Rider after Eubulon disappeared, which Xaviax promised to do after venting the other Riders. Not wanting to fight anymore after betraying his fellow Riders, he secludes himself with Sara in an illusion created by Xaviax until he is called upon again after all the Riders but Len are vented.

Season 1
Like the Earth Riders, he was tricked by Xaviax who pretended to be a refugee from Karsh to gain Adam's trust. In order for Adam to keep his secret safe, he is assigned to befriend Len and Maya Young, who is the temporary Siren, and keep them from destroying more of his devices. He destroys a monster attacking Len hoping to get back his trust saying that Xaviax had tricked him. But Len is not easily swayed as both trigger their Survive Modes. Adam attempts to use his Final Vent in retaliation but runs away.

Following the return of three of his fellow Ventaran Riders, he tries to gain back the trust of Hunt, Kamen Rider Axe, who threatens to vent him following a battle against Xaviax's monsters. Xaviax, fed up with his failure to infiltrate the Riders, sends monsters to attack Maya which Adam attempts to save. He later meets up with his mirror twin Kit Taylor who berates him for betraying the other Riders. Adam argues that Xaviax tempted him with something more important than Kit's offer.

This explodes into a battle between the two mirror twins as Kit, as Onyx, fights Adam and overpowers him until Eubulon shows up. Eubulon allows Adam to explain why he betrayed the other Riders, but the others aren't interested in what he has to say. After Len cools down, Adam tells them what happened and how Xaviax tricked him. They don't buy it at first but when Trent finds another transmitter, he is sent to upload the virus with Len and Chance. He manages to have Len give him the virus and in turn gives the virus to Xaviax to decode. Xaviax shuts down the transmitter to make it look like the virus worked and Adam manages to get the trust he needed. But Adam begins to have second thoughts about betraying his fellow Kamen Riders again. After talking to Kit who talks to Adam about how Xaviax tried to trick him using his father, Adam begins to feel guilty about his action. However when Xaviax sees this, he impersonates Eubulon and attacks and berates Adam in order to get him to betray the other riders again, this time out of his own free will.

During Len and Adam's mission to deactivate the last transmitter, Adam immediately starts attacking Len which culminates into a heated fight between both of them, even activating their Survive Modes. As Adam goes to make the final blow on Len, he finds that he can't do it. He revealed that he had given the virus to Xaviax who is proceeding to reactivate all of the transmitters. He surrenders his deck to Len and later explains what happened to him earlier when Eubulon attacked, but soon realizes that the Eubulon he saw was Xaviax when Kit spoke up. Finally discovering his resolve, he goes off to finish off Xaviax. Both Dragon Riders manage to prevent Xaviax from venting Eubulon by using their Strike Vents but soon find it difficult to fight off Xaviax. When all 13 Riders are assembled, they all use their Link Vents to destroy Xaviax once and for all.

Before sending all of the Ventarans back to Ventara, he goes into the illusion where Sarah is currently held and tells her the truth. During the Season 1 Epilogue, Adam was finally able to retire from the Dragon Knight deck and passes it on to Kit, who he knew would honor the deck far better than he ever would. So Adam decided to take Onyx deck.

Season 2
While being Kamen Rider Onyx, he doesn't need to being in suspended animation. Which means he can be with Sara. Also revealing on what he did to Ventara, talking about him being a Kamen Rider, Xaviax, Earth, and how he chose her over Ventara and causing the planet's destruction.

When Trent was no longer under Xaviax's influence, Trent want to be a Kamen Rider again. So Adam decided to give the Onyx deck to Trent and retired being a Kamen Rider.

Default
Rider Statistics Ability Parameters: Dragon Knight has a very wide range of moves, most involving his contracted Advent Beast Dragreder, as well as a varied set of Advent Cards making him relatively balanced in terms of potential combat ability. However, he does not have any trick based Advent Cards like Camo's Clear Vent or Sting's Copy Vent or possess a personal weapon like Wing Knight's Dark Visor, Siren's Blanc Visor or Torque's Magna Visor. Dragon Knight motorcycle is called the Dragon Cycle which transforms from his motorcycle
 * Rider Height: 190 cm.
 * Rider Weight: 90 kg.
 * Punching Power: 10 t.
 * Kicking Power: 20 t.
 * Maximum Jump Height: 35 m.
 * Maximum Running Speed: 100 m. per 5 sec.

Survive Mode
Rider Statistics: Ability Parameters: In his Survive Mode, his armor and Advent Deck change to a more defined crimson red and the dragon designs are even more emphasized. In addition, his new cards reinforce his balanced fighting style as well as give him a new trick-based Advent Card called Strange Vent. Dragon Knight's slot changes from his arm slot to a dragon-like gun called the Drag Visor-Zwei. The Survive card is inserted inside the dragon mouth and the cards are slotted on the side of the slot.
 * Rider Height: 193 cm.
 * Rider Weight: 95 kg.
 * Punching Power: 15 t.
 * Kicking Power: 25 t.
 * Maximum Jump Height: 45 m.
 * Maximum Running Speed: 100 m. per 4.5 sec.

Onyx
Rider Statistics: Ability Parameters: Kamen Rider Onyx is 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.
 * Rider Height: 190 cm
 * Rider Weight: 90 kg
 * Punching Power: 12.5 t
 * Kicking Power: 22.5 t
 * Maximum Jump Height: 40 m
 * Maximum Running Speed: 100 m per 4.5 seconds