Likes:
1) DiEnd: I love the suit design, it's different from the normal designs. Plus the fact that he can summon any rider is awesome.
2) IXA: He's a freaking paladin. Nago and Otoya were awesome users of the system
3) Accel: Hated his guts at first, but after the Liar Dopant arc, he started growing on me. Lol.
4) Zeronos: Yuuto's character was complex, and the idea of using the system caused people to forget who you were was different. And Yuuto would rather sacrifice himself to protect time was touching, even though he acted like a jerk.
5) TIE NEW Den-O: He hasn't gotten much screen time yet, but his suit design and Kotarou are pretty sweet.
5) TIE Gatack: I love the suit design, and the fact that Kagami went pretty much through one half of the series trying to fight off the Worms without a Zector, then finally being able to get one, made it cool.
Dislikes:
1) Kaixa: Kusaka is a jackass.
2) Another Agito: I couldn't get into his character, AT ALL. I'm sorry if people like Kaoru, but I can't stand him. lol
3) Rey: 5-second-appearance-movie Rider. the only good thing about him is that the actor who played him got to come back for Saga
4) Glaive: Say cheese! Wait...stop smiling! Please!
5) Ryuga: Mirror World Ryuki. If he had some screentime in the actual series, I could have liked him.