If you liked
Mahou Shoujo Madoka★Magica
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...then you might like
Vividred Operation
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Both series focus on a group of girls who become magical girls to fight enemies (each with their own color). In both, there is one girl (purple) who works from the sidelines with an unclear motive.
If you liked
Code Geass: Hangyaku no Lelouch R2
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...then you might like
Last Exile: Ginyoku no Fam
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Both series have nations who strive for "true peace", but go about obtaining it in the wrong way, in a war stricken world. lelouche and nunally (both their characters and relationship) are very similar to luscinia and augusta sara. it becomes more noticeable as the story progresses.
If you liked
Gintama
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...then you might like
Mouretsu Pirates
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The art and character design of mouretsu pirates feels very similar to gintama. both series are set in a world where space travel is the norm and space pirates roam the galaxy. mouretsu pirates doesn't have the samurai theme but both main characters fight with swords.
If you liked
Higashi no Eden
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...then you might like
Mirai Nikki (TV)
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twelve contestants are given a cell phone that becomes their "tool to survive" - the last one standing wins.
If you liked
Blood+
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...then you might like
Canaan
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Canaan and blood+ both focus on two girls (Canaan+Alphard/Saya+Diva) who came from the same origin but live to hunt down one another. Both Canaan and Saya fight not only for revenge, but to protect the people they love. Like Diva's group who creates Delta 67, Alphard's group creates the Ua virus, both which pose a threat to humanity. The stories each focus also on a journalist who happens to witness events they shouldn't have, getting themselves involved in the action... and a partner to the journalist who has an emotional attachment to a characters fighting the antagonists (Maria+Canaan/Mao+Kai).