If you liked
Code Geass: Hangyaku no Lelouch
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...then you might like
Guilty Crown
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Both of these series involve Japan in some way facing an army that has mech suits and an endless supply of manpower. There is one person who is able to rise up with power in the realm of Code Geass it's Lelouch and in the Guilty Crown series it's Shu. As the story progresses they both take you on a roller coaster ride of character development. Code Geass mainly dealt with class struggle while Guilty Crown deals with a virus. It's interesting to see how Guilty Crown will play out in the end though.
If you liked
D.C.: Da Capo
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...then you might like
Akaneiro ni Somaru Saka
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Both are based on H games, both have pretty similar main characters, both have rather interesting overtones. The way the plot flows for both series are also very similar.
If you liked
Zero no Tsukaima
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...then you might like
Toradora!
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Both have the characteristic master-slave sort of relationship. Taiga and Louise are also voiced by the same seiyuu (Japanese voice actor) so you may notice a similarity in the way that they talk. Ryuuji and Saito are also pretty similar because they are accepting of the position that they are put into. The way the relationship develops between the main characters also hold importance as each of the series progresses.
If you liked
Kimi ga Nozomu Eien
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...then you might like
ef: A Tale of Memories.
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Both have characters with tragic circumstances with ef- a tale of memories focusing on character evolvement while Kimi ga Nozomu focuses on the after-effects of what happens when tragedy strikes.