Total Recommendations: 3
If you liked
Shinseiki Evangelion
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...then you might like
Koukyoushihen Eureka Seven
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Both have strange, simillar mechas, some psychological problems and mystery. However NGE is more .. mature (?).
If you liked
Fullmetal Alchemist
|
...then you might like
Bounen no Xamdou
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Both have some mystery and Xam'd also have something similar to alchemy.
If you liked
Elfen Lied
|
...then you might like
Mnemosyne: Mnemosyne no Musume-tachi
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In both series you may find a lot of blood, beautiful womens with supernatural powers and both are pretty scary (at least in beggining).