Crowfeather also wins my spot for least favorite character. He's not just a jerk, he's pretty much emotionally abusive to his son and the mate he took to make the Clan "believe he was loyal," or whatever. The way he was still portrayed as sort of an okay dude in TLH disgusts me. Obviously there are quite a few characters who did MUCH worse than him, but that doesn't excuse the fact that he kind of just uses his new family for status. And him mourning a child he didn't raise, and didn't even know about, is supposed to make that ok?
I'm also in the "not a fan of Ashfur" camp, but I totally understand people who love him for his awfulness.
I'll join in the chorus for Onestar, too - he's unbearable, and between him, Crowfeather, and Heathertail, WindClan is my least favorite Clan for book portrayals. I remember in Twilight he gets really hissy with the other leaders for needing some help (in Leopardstar's case, it was poison killing her Clan and Leafpool helped them out by bringing herbs and stuff), and acting way too standoffish and overconfident. If he grew out of it, I'd understand and it'd be a funny little development. But lo and behold, Eclipse rolls around, where he launches an unprovoked attack on ThunderClan for? what reason? i don't even know. he's just a watermelon.