This is still around? Hmm, okay.

What if Shocker had succeeded in fully programing Ichigou into their warrior?

What if Taki Kazuya was Skull Rider and Hongo Takeshi was his right hand man + mentor?

I would imagine that Shotaro would use Kamen Rider Joker and he would wage a personal war against two sides, the Mueseum and Phillp and Ryu. Shoatro would probably get killed/lose his powers since he's up against a super powerful rider.

What if: Every Rider in Kamen Rider Blade had become a Joker?

BATTLE FIGHT!
Seriously.
While I'd believe Tachibana and Kazuma could restrain themselves, weak willed Mutsuki would go out looking due to the desire and instinct that being a Joker causes to find and destroy other Undead.

What if the original OOO (King) came back to life and started rampaging again?

He would have to first get his driver back and at lest one of each type of core medal which would mean getting it from Eiji. If he dose then will have a battle between OOO and Birth and OOO would win if he has a full combo most likely it could be close maybe. The good guys would then need to invent something to stop him like maybe the Poseidon Driver, or some sort of ray, or a second OOO driver for Eiji then we will have OOO vs OOO with both of them fighting and taking medals back and forth until either Eiji gets the Purple or Super Core Medals to give him the edge to win, or and upgraded Birth would be cool.

Okay what if all the main characters from Faiz learnd to talk to each other and stop listening to Masato Kusaka before everyone started to die

Faiz would be over in five episodes.

Alright, my turn.

What would happen if Philip never fell into the teleporter on Begins Night?

Then Faiz would be worth watching and I'd actually get around to finishing it.

For guncannon's question: I don't remember Begin's Night :S

What if the Kabuto Zector went to Kagami instead of Tendou?

Then we would have a less pretentious Main Protagonist.

What if Medusa and Phoenix sent Siren out right at the beginning? Would Haruto have lost?