Total Recommendations: 2
If you liked
Code Geass: Hangyaku no Lelouch
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...then you might like
Tengen Toppa Gurren Lagann
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Both use a Mecha genre to house underlying intellectual questions and reflections on modern society and the human experience. Both of the anime follow the Hero's Journey very closely (look it up), and follow similar themes of sacrifice, morality and the human condition of betrayal. Both series have amazing character development, although Code Geass starts off a little slow compared to Gurren Lagann in this sense. I'd really recommend persisting past the first 3-4 episodes if you find them a little dry, you won't regret it.
If you liked
Mahou Shoujo Madoka★Magica
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...then you might like
Psycho-Pass
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Both written by Gen Urobuchi and are similar in the sense that they provoke the viewer to question things about our society through the deconstruction of themes and genre.