Oh come on. How can you hate him? Once he got his king eyes on he was a complete badass.

Based solely on power I'd choose Agito for the top pic. Of everyone else it's apparent that either Ouja or Dark Kiva come in second. I'd honestly like to think this battle would come down to Ouja, Agito, and Dark Kiva and the other 3 would be irrelevant to the outcome. But in the end I'd say Agito wins with sheer power. And although I would say Dark Kiva is more powerful than Ouja I think Ouja would just Genocider his ass and move on.

Because he was an intolerable emo weenie and his "badass" shift is really abrupt and overrated, especially compared to the much more natural and effective character growth Ryotaro went through over the course of Den-O.

I did Agito overall, with Dark Kiva as my second.

Ouja (surprised?) and Dark Kiva...

two words...Killer Instinct. They have no issues going homicidal on fellow riders...after that, Ouja, because after the battle he would just advent and blind side DK...or as previously stated, Genocider kick into the portal of doom...

There. Den-O wins.

And Den-O wins and moves onto the semifinals!

Agito and Ouja. Agito because he's a powerhouse, and Ouja because he's Ouja.

The comparison doesn't work.
You can't just "Take Den-O's Imagin."
You're giving Fourze a win by making stuff up for Den-O to lose.

You can take away one of Fourze's switches and still have him lose a form too.