 If you liked
Shinseiki Evangelion
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 ...then you might like
Mahoromatic: Automatic Maiden
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Mahoromatic borrows a lot of elements from Neon Genesis Evangelion, both being made at studio Gainax, and they ended up sharing a lot of similarities. Both are about a war between humans and alien beings, called angels and saints, they have an organization working from the shadows, with a council that involves monoliths, and have overall a similar aesthetic, with good character designs and animation.