Beast King
The new breed.
Narutaki, A piece of unfinished Equipment, you either fix it or scrap it.
The way I look at it:
He's pretty much the J Jonah Jameson of the Kamen Rider world. There's never a real reason WHY he hates the hero...he just does.
How weird was he?
I mean that'd be like if you woke up one day and saw someone taking a morning stroll, and just decided to yourself for no reason,"**** that guy." and decided to dedicate your entire life to making his miserable. You don't know who he is or what he's done. In fact if you didn't see him that morning you'd likely never interact with him in the future, but for some reason you just decide you're going to ruin him, because "**** that guy."
That's Narutaki.