 If you liked
Shinseiki Evangelion
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 ...then you might like
Akatsuki no Yona
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The story or main topic is not similar at all (mechas and historical kingdom doesn't come together) but what both of them have in common is the character development!
Yona and Shinji are characters that really changed during the anime, both somehow realized what's important and what's not and both threw away their old self that lived a peaceful life with no big worries in order to become someone who can protect the others. And it was a painful way for both of them.