If you liked
Nanatsu-iro★Drops
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...then you might like
Kamichama Karin
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Both of these have a nice twist at the end and have a little more romance than the typical magical girl anime. If you like one I think you would most likely enjoy the other. Both have a cute love story and characters fighting to preserve what they hold dear in life.
If you liked
Kuroshitsuji
|
...then you might like
Pandora Hearts
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This is probably the best reccomendation to anyone who loves Kuroshitsuji. They have the same close relationships between the characters and each character has their own mysterious past and story to tell. Oz is somewhat like the optimistic version of Ceil. There is a lot that will keep you guessing and the music and art work are brilliant in both. If you like one I can promise you'll like the other. Where Pandora Hearts is a little more light-hearted it still has an ominous feel to it and like Kuroshitsuji it keeps you guessing who the bad guys really are.
If you liked
Slayers
|
...then you might like
Zero no Tsukaima
|
I'm incredibly surprised that no one has compared Zero no Tsukaima to Slayers yet. Lina and Louise are both "flat-chested" magicians having to compete with their F-cup rivals (Naga/Zerbst). Both series feature a sword weilding male character that the main character ends up falling for and the humor is similar. All in all, I thought Zero no Tsukaima was fun to watch and if you liked it I know you'll love Slayers.