 If you liked
Code Geass: Hangyaku no Lelouch
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 ...then you might like
Taiyou no Kiba Dagram
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They are the most strategic mecha shows. Both are real robot shows with strong worldbuilding, politics and tactics. Both are stories of revolution for independence. Code Geass is a great show, very entertaining and with a good story, but Fang of the Sun Dougram is way more mature and profound, with a more complex and rich story and a lot more realistic. It gets old but is a strong similar anime to Code Geass.