Mine is definitely Clannad, and you can tell definitely tell from:
1) My Coup
2) My phone wallpaper
3) I use the Fuko avatar on other websites
So ya...love that anime.
What's your favorite?
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Maybe Welcome to the NHK, maybe Holic, Maybe Steins; Gate, maybe Darker Than Black (season 1) as a favorite. Avatar: TLAB is nearly if not spot on in all aspects (in my opinion), but some of the other ones really left a lasting impression. I guess that assumes that you call Avatar an anime though.