 If you liked
Angelic Layer
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 ...then you might like
Magic Knight Rayearth
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Magic Knight Rayearth and Angelic Layer are not that similar in terms of storyline, but if you want to check who inspired Suzuhara Misaki and her angel Hikaru, reading the first series of Rayearth is a good call.
Shidou Hikaru has the same determination and fighting spirit of Misaki/Hikaru. Read both series and compare the development of these two "little" girls with a lot of challenges to win in their lives.