No no, Miki is my favourite (kinda)
...My least... would be Azusa. She kinda bores me. I don't have much interes. Though, kinda ironic; her episode was freaking amusing! (it may be the funniest one I think)
Takane, what kind of idol is she supposed to be? I know it's a game/anime, but do they really need such unrealistic characters? Her voice is pretty average, though at least her food shenanigans are funny.