 If you liked
Kidou Senshi Gundam: Gyakushuu no Char
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 ...then you might like
Shin Kidou Senki Gundam Wing
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Wing is based on Universal Century and some of the elements of Char's Counterattack are incorporated into Wing. Zechs Merquise and Treize Krushrenada are similar to Char Aznable but mostly his actions and Zechs is the one who's the closest than Treize. Philosophy are similar regarding Earth and Space and those who wants to change the world through actions. OZ and UESA and colonies are more closer to being based on Zeon than Earth.