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Most definitely, Prisoner of Azkaban.  The story is rich, and engrossing, and remains my favorite of all seven.  The movie & soundtracks, too.   ;D

Hermione, because even though she is a know it all, she has a huge heart as evidenced by SPEW, and the countless times she bails the boys out with their homework, and the kindness & compassion she displays towards Grawp, Kreacher, and the different creatures & people that look down upon her for being a "Mudblood".

Tonks..she may be an Auror, but she's just cool.  Not perfect, but clever enough to be an Auror, and she's blind to faults..her love for Remus, for example.  It sucked, what happened to her & Remus in Book 7. What was the point?

Mad Eye Moody, because he reminds me of my granddad (except for the eye).
Molly Weasley, because she reminds me of me!

Probably a wolf, fox, or racoon.  Something very clever, a predatory pest.

Yes, when HP lost Padfoot, and the headmaster.  I was really ticked off at Jo when he lost Sirius..my God, how much is she going to put this poor kid through?! It only got worse with HBP..my husband thought I was having a nervous breakdown the first time I read HBP because I cried so hard when Dumbledore died. 
I still do almost every time I read the books..my daughter and husband have learned to be prepared when I do..