[henshinzero]

In some of the KRs, some riders turned out to be an enemy's monster.

ex.
Takumi/Faiz: Wolf Orphenoch
Hajime/Chalice: Joker
Eiji/OOO: Kyoryu Greeed

But what do you think if in some series like Kiva, Double & Wizard...

Kiva: Instead of that colored glass on Emperor Kiva's visor, how about a half-breeded bat fangire form instead? King's bat fangire form looks ugly, but in Wataru Kiva's look, it should look Batman Beyond or something.

Double: If Shotaro gets under a mind control or something, what if Shotaro becomes the Joker Dopant while Phillip is forced to become the Fang Dopant to save his fallen partner?

Wizard: Haruto should've became the Dragon Phantom. Too bad it didn't happen. If it did, with Koyomi's death affecting him, he'd be drowned in despair.