 If you liked
Shin Kidou Senki Gundam Wing
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 ...then you might like
Guilty Crown
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Groups fighting for freedom (Japan and Colonies) against tyrannical factions (GHQ and United Earth Sphere Alliance). Guilty Crown is similar to Code Geass whose story is based on Gundam Wing but with a more Evangelion approach meaning more supernatural powers are involved than just aristocrats and mechas.