 If you liked
Shinseiki Evangelion
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 ...then you might like
Shinkansen Henkei Robo Shinkalion The Animation
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Its quite easy to see where Shinkalion got its inspiration from, just look at the names "Shinkalion" and "Evangelion".
In both you will find a story where children with high compatibility are put into giant mecha's by a certain organisation (that the protagonists father is apart of) to combat against mysterious apposing forces.
The only major difference is that Shinkalion uses Evangelion's story formula for a children's show. So you will find that its more about the bonds of family and friendship, unlike Evangelion particularly dark story.
So if you'd like to see Evangelion's basic story formula used for a children's show, I recommend that you
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