 If you liked
Code Geass: Hangyaku no Lelouch
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 ...then you might like
Nobunaga the Fool
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The character designs in these two anime look extremely similar. Both main characters have the same feeling and end up obtaining an amazing power. Both are mecha anime, and both kind of have that east/west alternate reality world-building theme.
Both are mecha that focus on the MC who is outsmarts the world. Code Geass was a masterpiece and Nobunaga is airing but you can thing of Nobunaga the Fool as Code Geass in the shugun period
Both are about people using people using giant mecha's to take power. Code Geass uses a historical form of government with an all powerful king, similar to Nobunaga the Fools' King Arthur and some of the characters from Nobunaga the Fool are actual historical figures such as Julius Ceasar and Jeanne d'Arc.