The Chamber of Secrets, actually. I decided, since I'd seen the first movie, just to start on the second book. I went back after and read through the first.
Which is your favorite and least favorite HP book?
For most favorite, for a long time it was The Prisoner of Azkaban, but then The Half-Blood Prince came out... and then The Deathly Hallows. Haha. :) I used to quite dislike The Order of the Phoenix; I thought it was too angsty and dark. Now I understand it, partly because of the movie but also because I've been to angsty teenagerland myself. So I don't really have a least favorite anymore!
Which HP character is your favorite? Which is your least?
For favorite, Hermione, obviously. I also really like McGonagall and Luna and Neville and Lupin and Lily and James and Fred... For least favorite, Umbridge, of course, closely followed by Rita Skeeter and Bellatrix Lestrange.