 If you liked
Kidou Shinseiki Gundam X
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 ...then you might like
Kidou Senshi Gundam SEED Destiny
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Earth vs Colonies, protagonists are similar (Shinn and Garrod), Groups fighting for freedom (Minerva Crew and Freeden Crew) against tyrannical organizations (UNE and Space Revolutionary Army and Earth Alliance/Blue Cosmos). Twists occur and something behind the scenes is seeking far greater than just ending the war.