If you liked
Sen to Chihiro no Kamikakushi
|
...then you might like
Howl no Ugoku Shiro
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Both have gorgeous art and they both dwell in fantasy and the supernatural. They also have the same producers so they have similar art styles. What's more, they both have fascinating plots and lovable characters.
If you liked
Death Note
|
...then you might like
Code Geass: Hangyaku no Lelouch
|
They both have main characters that are very similar: both are intelligent, cunning, a little bit twisted, and basically antihero. Both the main characters have acquired an exclusive power that they can use to fulfill their ideals, and they would use any means to do so.
If you liked
Ouran Koukou Host Club
|
...then you might like
Special A
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They both have this setting where a normal girl goes to a prestigious school attended by rich kids, but still manages to cope and fit in. Both series have comedy and romance thrown in (though in Ouran the romance is more evident in the manga).
If you liked
Sayonara Zetsubou Sensei
|
...then you might like
Maria†Holic
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Both series have the same producers so there are elements which are similar between the two. The comedy and the art style are basically similar.
If you liked
Shaman King
|
...then you might like
Rekka no Honoo
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The theme of both anime revolves around tournaments and fighting. The other uses spirits, the other uses secret ninja weapons. I think you'll love them both.
If you liked
Naruto
|
...then you might like
Rekka no Honoo
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Although they are not essentially similar except for the fact that both anime has something to do with ninjas, I think that if you like Naruto you'll also like this anime. If you're a die-hard ninja fan Flame of Recca is also worth checking out.
If you liked
Shakugan no Shana
|
...then you might like
Zero no Tsukaima
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The two main characters share the same voice actors. Shana is also a tsundere like Louise; looking at one reminds me of the other.
If you liked
Kuroshitsuji
|
...then you might like
Pandora Hearts
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Both anime have a mix of comedy and the supernatural, with quite a few action scenes too.
If you liked
Kidou Senshi Gundam SEED Destiny
|
...then you might like
Code Geass: Hangyaku no Lelouch
|
At first glance you would immediately see the distinct similarity between the two--both revolve around mecha and political warfare. Even most of the characters from one series seem to have a counterpart with the other.
If you liked
Ayashi no Ceres
|
...then you might like
Fushigi Yuugi
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Same author, same art style. While watching one you'll get the feel of the other. Both are made up of romance and fantasy. The only difference is that Ayashi no Ceres has a more serious atmosphere while Fushigi Yuugi has some comedy thrown in the mix.
If you liked
Fruits Basket
|
...then you might like
Ouran Koukou Host Club
|
Ouran High School Host Club and Fruits Basket are two anime definitely worth watching. Aside from being similar in terms of being a reverse harem, both of these anime will surely keep you on your seat with their light-hearted comedy and romance.