 If you liked
Kidou Senshi Gundam 00
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 ...then you might like
Guilty Crown
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If you like Gundam 00 even Code Geass, try Guilty Crown as well even if you're also big in to Sci Fi and Mechas as well. Other than just mechas, supernatural powers are also involved including drama, interactions, romance, twists, and revelations that will shock the whole story to another level which you'll never forget for your entire life.