Lightning
Ashfur was my favorite for a long time and I remember being SO ANGRY when Long Shadows came out because I was firmly in the Ashfur Did Nothing Wrong camp. I cried. I cried a lot. It was awful. Besides him my favorites would probably be Cinderpelt, Tigerstar, and Scourge.
I was furious when I read that because I'm like “nooo Ashfur damnit” and now every time I mention I like him, I get called a horrible person because I'm apparently glorifying abusive relationships or something like that. I mean, any reader knows that he really did do a lot wrong. Plotting murder is so very wrong…but I still like my Trash Baby.