Series: Den-O
Main Rider: Ryotarou
Secondary Rider: Zeronos (but Onodera Yuuske is a close second)
Belt Gimmick: Decadriver
Rider Design: Kiva
Final Rider Form: Den-O Climax
Villain Group: Fangire
Villain Design: Imagin
Opening Song: Climax Jump
Series' Score: Decade

Yes, I've only seen Den-O, Kiva, and half of Decade (in terms of Kuuga-Decade).

Okay, well this post got glitched.

Series: Blade
Main Rider: Blade
Secondary Rider: IXA (Otoya Kurenai)
Belt Gimmick: Kamen Ride Cards
Rider Design: Leangle
Final Rider Form: King
Villain Group: Undead
Villain Design: Fangire
Opening Song: Elements
Series' Score: Kiva

Series: Den-O
Main Rider: Kabuto
Secondary Rider: Birth (Akira Date)
Belt Gimmick: Decadriver
Rider Design: Kabuto
Final Rider Form: Final Kamen Ride Decade
Villain Group: Worm
Villain Design: Imagin
Opening Song: Blade Brave
Series' Score: Decade