 If you liked
Kuroshitsuji
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 ...then you might like
Hataraku Maou-sama!
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-Both of the main characters Maou/Sebastian are Demons, who acts kind of very nice and kind way, also they have a strong confidence to serve with them (Maou: As a employee job for serving a fast food chain to the customers) and (Sebastian: As a butler being a servant job to serve with his master Ciel Phantomhive). They have powers too, But they may be bad sometimes.
-Having a conflicts and confrontation of Demons and Angels.