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[Delightfully Evil LordM]

I've got some suggestions too.

Definitely check out the Fate/ series (stay night is one, zero is the other)
Needless is pretty good.
FLCL is great if you like a short series.
Abenobashi Magical Shopping Arcade is funny.
One of my all time favourites though is Slayers.

Also, I found this funny that someone above me mentioned InuYasha being a long series right after mentioning Bleach, a series about 2 times longer and still going.  

[Meegane]

If you like detective stories, I would suggest "Gosick" or "UN-GO".

First, Gosick is a lovely story around a lolita detective Victorique and a japanese boy called Kazuya. They encountered a lot of strange mysteries which the girl solved them one-by-one. Victorique is a clever adorable doll-like girl which holds a big secret.

"UN-GO" is another myster work with a more modern background. The hero, Shinjuro Yuki, known as "the Last Great Detective" and his partner, Inga paired together to unveal hidden truths in the world. Later revealed that Shinjuro Yuki should be died already.

If you like mystery series, I think you will like them