Favorite: Serius Black. I don't know why exactly but I just think he was awesome. Died too early and should've been in the movies more though.
Least Favorite: Bellatrix Lestrange. Actually, thats putting it lightly. She's the most hated, not the least favorite. When I saw Order of Phoenix the first time and watched her run around happily screaming "I killed serius, I killed serius!" I wanted to jump into the screen and rip out her throat. Its odd, I think I must be going insane, because I've never hated, despised, or wanted to kill anyone as much as her. And she's a fictional characther. And everyone she killed, was fictional.
I still can't watch that scene without balling my fists and clenching my jaw. This only enforces the belief that I'm completly mental since that scene hasn't scarred anyone else this badly.
I hate Bellatrix that crazily too. its just that i hate Snape more, ppl call me crazy for that.
Thats the awesome power of J K Rowling.
Dooby and The weasley twins had to be my faves (RIP Fred, we miss you) I also love luna, tonks mad eye and bellatrix (she's so cool, and you know it!)
I'd have to say that merops brother was one of my least favourite, even if he was only in like 2 chapters. And, I wasn't a particularily big dumbledor fan either. Not sure why.
And of course, cormac mclaggen and lavender brown
Cornelius fudge would have to be my least favourite, along with umbridge