Molly Weasley, and the one scene that got to me in GoF...

[Eric Oppen]

No: HPFGUIDX 25600

I like Molly Weasley a lot, not least for the way she bonded to Harry as the
"mother" he never had the chance to know---and, for the first time, Harry's
experiencing a mother's love, even though Molly's not his biological mother.
She's far more a mother to him, and a far better mother in every way, than
Petunia Dursley is to either Harry OR Dudley.  (My own guess is that about
five minutes after Harry hits the age of majority, Petunia Dursley is going
to get a visit from Molly Weasley, and there will be merry Hell to pay...oh,
I'd LOVE to see that!  I'd crawl a mile over broken glass, naked, to beg my
worst enemy for money to pay the bribes to let me in to see that!)

Harry had been holding up all through the Portkey, the cemetery, the duel
with the most feared wizard of his time, seeing Cedric Diggory die for no
reason other than "being the spare," witnessing all sorts of horrible
magic...but when Molly comforted him for the first time in his life, _this_
nearly broke his iron self-control!  This, alone, tells us a lot about just
how barren and bleak his life is chez Dursley, even if we didn't already
know about it from seeing him with that charming family.  (Whimpering
house-elf-style apologies for getting so fervent, but I _really *really*
REALLY_ dislike child-abusers...if Voldie were going after them instead of
Muggles and Muggle-borns, I'd be cheering and screaming and giving him
pointers.)

I agree with the people who've been saying that Molly W. is actually an
extremely powerful witch.  The thing is, we don't _know_ what she did before
she and Harry met...for all we know, she was actually a greatly respected
and feared Auror, working side-by-side with Mad-Eye Moody, who retired
because she'd fallen in love with a minor bureaucrat at the DoM, married,
found herself pregnant, and didn't want to risk her baby-to-be's life, even
though she'd been used to risking her own ten times a day.