If you liked
Aria the Animation
|
...then you might like
Sketchbook: Full Color's
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Both are slice of life anime with a very laid back and relaxing feeling and any Makino Yui fans should definitely check these out, she sings the OP in every Aria season and she sings the ED in Sketchbook.
If you liked
Seto no Hanayome
|
...then you might like
Nogizaka Haruka no Himitsu
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Both series have a guy discovering a girl's secret and trying to protect that secret, while also growing closer to the girl as the story progresses. Both are predominately Romance Comedies.
If you liked
Aria the Animation
|
...then you might like
Mahoutsukai ni Taisetsu na Koto: Natsu no Sora
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Both shows are slice of life and give a similar relaxing vibe and tend to encourage you and make you feel better.
If you liked
Zero no Tsukaima
|
...then you might like
Toradora!
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The obvious similarity pertains mostly to the main female characters of both manga, tiny but very proud and violent. Taiga even looks almost exactly like Louise except with brown hair.
If you liked
Shuffle!
|
...then you might like
Clannad
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Both are romance harem anime with a guy and five girls and both have a school setting. The main male characters are both similar as well. Shuffle! is more fantasy compared to Clannad's mostly realistic story, with the exception of one mostly supernatural arc.
If you liked
Lucky☆Star
|
...then you might like
Minami-ke
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Both are slice-of-life, episodic comedies with mostly female characters (though minami-ke has more male characters).
If you liked
Samurai 7
|
...then you might like
Utawarerumono
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Has similar war and rebellion stories with characters trying help others. They both also have a fantasy aspect to them that doesn't really reveal itself completely till the last arc in both shows.
If you liked
Tsukuyomi: Moon Phase
|
...then you might like
Black Blood Brothers
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If you like vampires and fighting, you'll like both
If you liked
Gakuen Alice
|
...then you might like
Negima!?
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Both have romance and magic abilities
If you liked
Gakuen Alice
|
...then you might like
Mamoru-kun ni Megami no Shukufuku wo!
|
Similar magic and school setting. In Gakuen Alice it's called Alice and in Mamoru-kun it's Beatrice, both being abilities though Alices are much more specific.
If you liked
Zero no Tsukaima
|
...then you might like
Hayate no Gotoku!
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Voice Actor for Nagi and Louise is the same and in both the main male character serves the main female character. The main female characters share almost the same personality and the male character is forced to save her several times.