(spoilers)
(1)Luna Lovegood
(16)Winky
I've dressed up as Luna for Halloween. Really, don't expect me to be unbiased here. As for winky being exemplary for her species...yes she is, but the "normal" house elf is very boring.
(8)Aragog
(9)Arabella Doreen Figg
"we might as well be hanged for a dragon as an egg"
"you worthless pile of bat droppings"
"well, it's no good crying over spilt potion"
"but the cat's among the pixies now"
Mrs Figg. Can pass for a Muggle. And yet when the veil of secrecy goes down she's quite possibly the most jargon heavy character in the whole damn series. I'm not even sure what some of these sayings actually mean, which is kind-of awesome. In the battle of two fairly obscure characters, I'll take randomly awesome, rather than pragmatically hungry.
(5)Viktor Krum
(12)Wilhelmina Grubbly-Plank
I'm really not sure who to vote here. Krum is a bit of a dull disappointment in every scene besides his world cup quidditch appearance. Grubby Plank is...unremarkable in and of herself--basically just a high-quality teacher. But Harry becomes completely irrational about the whole situation, snapping at anyone who praises her lessons. It's an exercise in irrational loyalty. Then again, Ron gets irrational around Krum too, but somehow that's less interesting to me--people getting completely irrational around romantic competition is like...well Harry does that around Dean and Cedric, Hermione does that around Lavender and Fleur, Ron does that around Krum, Cho does that around Hermione, Krum does that around Harry. Kids in HP being immature about their love life just doesn't feel that special. But the immaturity of supporting an honestly bad teacher when presented with an obviously superior alternative, purely due to loyalty feels...a little more unique? I don't know: I'm not sure there's a "right" choice for this match.
(4)Lily Potter (née Evans)
(13)Irma Prince
"I'm sorry."
"I'm not interested."
"I'm sorry!"
"Save your breath" [...]
"I only came out because Mary told me you were threatening to sleep here."
"I was. I would have done. I never meant to call you Mudblood, it just –"
"Slipped out?" There was no pity in Lily's voice. "It's too late. I've made excuses for you for years. None of my friends can understand why I even talk to you. You and your precious little Death Eater friends – you see, you don't even deny it! You don't even deny that's what you're all aiming to be! You can't wait to join You-Know-Who, can you?"
You know, for a character with almost no lines, Lily is a really freaking intense character in the little screen time she does get. Damn near every scene she's in is a top quality scene where her behavior is not necessarily what you'd expected from all the stories built up about her.
Also: her opponent is so obscure that we didn't even get her name right (it's Pince, not Prince--noteworthy that Eileen Prince is so much more memorable than Irma Pince despite Eileen not getting any lines...).
--
Cats land on their feet. Toast lands peanut butter side down. A cat with toast strapped to its back will hover above the ground in a state of quantum indecision