I would love to answer this one.... but theres too many Anime that i watched.... I would say Ciel Phantomhive from the Black Butler♥ I love that character but i also have to say Tyson from Beyblade... I know its an old character but yea i love Tyson and allways have♥ =)
Puella Magi Madoka Magica! I love the entire cast (they're in my signature), the music is great, the story is fantastic and thought-provoking and deep and...I think you get the point.
I love Hetalia, Black Butler (Season 2 more then 1 thb.. ) , Durarara!! and Maria x Holic Too many to have just one favorite xD
Darker Than Black, the only anime I've been compelled to watch all the way through out of personal enjoyment.
Kuroko No Basuke, Death Note. Inazuma 11, K-On!. Fooly Cooly, Evangelion, Puella Magi Madoka Magica. Mainly Inzauma and K-On because of nostalgia purposes, they're my "feel good" animes. I'm currently watching Tamako Market, and I have to say it's adorable.
My favs are Tenchi Muyo, Outlaw Star, and Trigun. I grew up during the Toonami era, so my tastes are more old school. :3
honestly, i've grown to hate anime because most of the time they slaughter the amazing manga/graphic novels they're supposed to animate. i prefer to read manga. anyway, that aside, there are some anime that i truly do enjoy. my favorite is probably "read or die," maybe because i haven't read it in graphic book format hahaha. i also liked the "xxxholic" anime because it didn't completely ruin or dumb down the original story. and i think i still like "flcl," also probably because i didn't read it. there are others i can tolerate, haha, but i'm not going to list every one.
How'd I forget Durarara.. and Gurren Lagann.. and Baccano... There's so many that I've enjoyed, I don't think I can pick an ultimate favourite. I've yet to watch Cowboy Bebop, but I'm lazy. Wolf's Rain is another worth mentioning.