Elfen lied because it was my first anime. Skipped a whole day at school, pretended to be sick, to watch all episode at once :P
Others can be Full Metal Alchemist (and brotherhood), Claymore, Death Note, Tetsuwan Birdy Decode, K, ...
Clannad (& the After Story) is by far the most beautiful story I've ever seen in an anime series - my absolute favorite.
A few others (in alphabetical order, lol):
Air
Angel Beats!
Bishoujo Senshi Sailor Moon
Death Note
Fruits Basket
Hanbun no Tsuki ga Noboru Sora
Higurashi no Naku Koro ni
Hyouka
Inu x Boku SS
Kaichou wa Maid-sama
Kamisama Hajimemashita
Kanon (2006)
Kimi ga Nozomu Eien
Kimi ni Todoke
Kobato.
Lovely★Complex
Ouran High School Host Club
Skip Beat!
Special A
Steins;Gate
Suzumiya Haruhi no Yuuutsu
Toradora!
ooops... Did I really say "a few"? Sorry, guys.
Ouran High School Host Club
Vampire Knights
Saiunkoku Monogatari
Pretear
La Corda d Oro
Kaichou wa Maid sama
Special A
Fruits Basket
Slam dunk
Dragon Ball
Gundam Wing
There are waaayy too many to list here, so this is a few: Full Metal Alchemist Brotherhood, Blood+, Shingeki no Kyojin, Bakuman 1,2, & 3, Shigurui and the ever popular Bleach and Naruto. As I said, there are many more, but we'll save some for later.
The most underrated anime is: rainbow nisha rokubou no shichinin
I can rewatch this 100 times and I wouln'd get bored. So many emotions, such a deep story, I loved it!!
Hard to choose. If I only look at series I would say the following:
- Natsume Yuujinchou (no matter how much seasons they make, they never get boring)
- Kyou kara Maou (this makes me laugh every time)
- Tenshi na Konamaiki (the main character is just too funny)
- Special A (enjoyed the competitiveness she has)
- Ghost Hunt (great story lines, still hoping for a sequel)
- Vampire Knight (I know it is not the best anime, but sometimes you just love things you rationale know are not that great. Hahaha.)
- Saiunkoku Monogatari (wonderful story, also still waiting for a 3th season)
- Shiki (horror that makes you think about good and bad. Managed to surprise me in its story line)
Not in any order:
One Piece
Mushishi
Natsume Yuujinchou
Ano Hana
Puella Magi Madoka Magica
Gintama
Usagi Drop
Ghost in the Shell (movies and all seasons)
K-ON!
