I love fantasy-themed animes, and some comic ones... so I'd say Elfen Lied, Dokuro-chan, Sora no Otoshimono.
Neon Genesis Evangelion, High School of the Dead, Yu Yu Hakusho, and Cowboy Bebop are all very high on my top 10 of all time.
Full metal alchemist its the best
Naruto Shippuden
HunterxHunter n3n The original one...can't bring myself to watch the remake ;;;;; Code Geass is also very good.
Samurai Champloo. So good.
My first and still favorite FLCL
Currently following:
Fairy Tail
Binbougami ga!
Accel World
Natsuyuki Rendezvous
Moyashimon Returns
Naruto Shippuden
Dakara Boku wa, H ga Dekinai
Yuru Yuri season 2
Chouyaku Hyakuninisshu: Uta Koi
Arcana Famiglia
Hunter X Hunter
One Piece
Sword Art Online
Kokoro Connect
Hagure Yuusha no Estetica
Nazo no Kanojo X