Suisei no Gargantia stands tall as my AOTY. Loved the plot, characters, and concept. I can't wait for the second season.
Gundam Build Fighters, Monogatari Second Season, Blood Lad, Danganronpa, Attack on Titan (I read the manga after couldn't stand the suspense of the ongoing anime, so it counts...right) and WataMote are runners up.
Lemme mix it up with my best of 2013:
Waifu of the Year: Yaya (Unbreakable machine doll) Badass, adorable automaton/android/
sexban-doll that I don't mind as clingy as she is even having yandere tendencies. It was always painful to see her hurt or cry.
Gotta read the manga and/or LN to find out a bit more about the horned Yaya and more about the setsugetsuka trilogy. They needed more screentime
OP: Danganronpa - Never Say Never
ED: Maware Segetsuka (UBMD)/ Despairity: A Hero's Treatment (Danganronpa)