Martin Bronson

Martin Bronson is the original Power Rider, and therefore Marty's Mystica counterpart, who betrayed the other Riders sending them (save for Kase and Len) to the Mystic Void in order to help Wiseman take over Mystica. Martin wanted to retire from being a Rider after the Rider Master disappeared, which Wiseman promised to do after getting rid of the other Riders. Not wanting to fight anymore after betraying his fellow Riders, he secludes himself in an illusion created by Wiseman until he is called upon again after all the Riders but Emmett are gone.

History
Like the Earth Riders, he was tricked by Wiseman but since then, his betrayal weighed heavily on him. In order to keep his secret safe, he is assigned to befriend Emmett and Jen, who is the temporary Land Rider, and keep them from destroying more of his devices. He destroys a Phantom attacking Emmett hoping to get back his trust saying that Wiseman had tricked him. But Emmett is not easily swayed as he triggers his Ultra Mode while Martin activates one of the Drago Modes. Martin attempts to use his final attack in retaliation but runs away.

Following the return of two of his fellow Mystic Riders, he tries to gain back the trust of Rylan, Hydro Rider, who threatens to send him to the Mystic Void following a battle against Wiseman's Phantoms. Wiseman, fed up with his failure to infiltrate the Riders, sends monsters to attack Jen which Martin attempts to save. He later meets up with his mirror twin Marty Brown who berates him for betraying the other Riders.

This explodes between a battle between the two twins as Marty, as the Rider Master, fights Martin and overpowers him. After regaining control of his anger, Marty allows Martin to explain why he betrayed the other Riders but the others are not interested in what the traitor wants to say. Eventually, Martin does prove his worth and helps the other Riders stop Wiseman's Phantoms.

Wiseman begins to realize that Martin is having second thoughts about betraying his friends. He disguises himself to look like Marty and attacks Martin in order to turn him against the Rider Master. Emmett and Martin are sent out to disable the final endpoint. Adam plots to send Emmett to the Mystic Void, but first decides he should let Emmett disable the endpoint to give the others a false sense of security. Marty checks in with Emmett and tells him to stay alert, and he and Mya go as back up. Beast Rider and Power Rider battle the Golems surrounding the final endpoint, and both of them transform into one of their upgraded forms. After Beast Rider disarms the endpoint, Power Rider attacks him and they engage in battle. Marty and Mya arrive at the scene and find the endpoint shut down, but no Rider. Elsewhere, Power Rider determined to go through with his plan tells Beast Rider that he was the one who was planning to create a second ritual, not Wiseman, and that he wouldn't give up on Kaya for anything. Beast Rider and Power Rider transform into Ultra Mode and Ultra Rider and continue to battle. Ultra Rider prepares to vent Beast Rider but Martin doesn't hold up to well as Ultra Rider as the Infinity Ring was only compatible with Marty since it was created from his own power. As such, dark energy emits from Martin and transforms him into Dark Rider, which causes the Infinity Ring and a cracked Power Driver to fall from Martin. Just then, Marty and Mya arrive at the scene, and Marty finds that he can combine the Power Driver and Master Driver, which now allows him to be able to use the abilities of both Power Rider and Rider Master. He then transforms into Ultra Rider to overpower Dark Rider. Martin confesses that the endpoints aren't "really" destroyed. They try to contact Kizaki to explain the situation, but Martin reveals that they're too late, as he has already kidnapped Kaya and the other two Mystic Riders. He then binds Mya and Emmett with the Bind Ring and the three teleport to the location of the ritual. He then sends the four Riders to their endpoints and places an unconscious Kaya to the midpoint.

Modes
Power Rider's forms are called Modes. In any Mode, Power Rider uses a fighting style that mostly deals with kicking and acrobatics seen in the dance-like martial art Capoeira. This is to avoid punching with his hands so that he doesn't break the rings he wears on them and hurt his fingers.