 If you liked
Kidou Senshi Gundam SEED Destiny
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 ...then you might like
Guilty Crown
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Gai Tsutsugami and Rey Za Burrel are similar and the main protagonist Ouma Shu is similar to Kira Yamato and the same goes for a pink haired singing girl (Inori and Lacus) . Story involves groups fighting corruption and at some point, revelations, corruption drama, and tragedy involve.