Huh, weirdly, that's actually a tough question for me. I find that generally when I become a fan of a series, it's really only that particular series I'm interested in, and even if I read other works by the same author, they don't really strike me the same way. (I've read a lot of Colfer's other works, including books one and two of WARP, The Supernatulist, The Wish List, Half Moon Investigations, Airman, etc., and even though I liked them all right, it's still only Artemis Fowl that I really felt a connection to. It's the same with JK Rowling, and KA Applegate--I love Harry Potter, and I love Animorphs, and I love the way those stories are put together--but it feels off to call them my favorite authors, even if I respect and admire them, when I'm not really following their other works.)
I guess I've read quite a few different books by Brandon Sanderson, and I like his style quite a bit. (Elantris, and the Mistborn series.) Shannon Hale might be another one, I really liked her Goosegirl series, and the Princess Academy.
“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)