Hitagi too awesome to explain why, so I'll just say Senjougahara Fascination.
Nadeko first character by Hanazawa Kana I've heard making Nadeko extra cute, so adorable
.
Mayoi cute, hilarious stuttering, and awesomely amusing scenes with Koyomi.
Koyomi the show couldn't have existed without him, and wouldn't have be so funny at times without his clever comments, and comebacks. Plus he's good guy who managed to help all the girls
.
Rest of characters were great still, just not enough to be favorites of mine in this series.