I laughed so hard when I saw this topic. XD!
Well, out of all the characters (including the new additions), I'd have to choose Snape, since he was always my favorite HP character. Between Voldemort and Umbridge, I suppose rationally I'd have to go with Umbridge, since I feel like I would have a better chance of survival, but if I had to choose which character I hated more, it would definitely be Umbridge. (I think it's interesting that characters like Umbridge typically are more hated than characters that are the primary villains. It's kind of like if you compare Opal Koboi and Ark Sool. In the 'least favorite AF character' poll on this site, Sool got way more votes than Opal. There's just something so infuriating about those characters who are technically within the good community, but abuse their power in such a way that they actually hurt the cause of the good guys while making it appear that the good guys are out of line.)
“After all, absolutely no one can help but suspect a criminal, liar, and manipulator of committing crimes, lying, and manipulating. And of course, no one is more aware of that simple fact than Artemis Fowl.”
Opal sets into motion her most diabolical scheme yet, to frame Artemis and turn his closest friends against him. Only this time she has a new calculating partner who knows Artemis better than he knows himself. [Post TAC] https://www.fanfiction.net/s/8336552/1/Noble-Heart
...Shameless self-advertising, guys! C;
(And if you're really bored: http://axxonu.deviantart.com/gallery/28912232/Artemis-Fowl
AF fanart. ;J)