Here are a few of my favorites! Yes, I'm a sucker for romance adventure stories, and yes, I'm an Arty with someone else fan.
#1) "Kiss Me, I'm Irish {an Artemis Fowl fanfiction}" on Waatpad by arty_writes
Genre: romance, adventure
#2) "The Artist and the Hunter" on Fanfiction.net by iesnoth
Genre: romance, adventure
UNCOMPLETED!
#3) "Spirited Away" on Fanfiction.net by ButterflyMiko
Genre: adventure, maybe some romance
#4) "Vanity makes you say things like 'I deserve a better life than this'" on Fanfiction.net by mentosmorii
Genre: Friendship, hurt/comfort
#5) "Diminutive" on Fanfiction.net by Keitorin Asthore
Genre: Drama, humor
These are my top 5! I have read other good ones, but these are my favorites. I am currently reading The Book of The Ages.