 If you liked
Yuu☆Yuu☆Hakusho
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 ...then you might like
Nurarihyon no Mago: Sennen Makyou
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I've always felt Nurarihyon no Mago was strongly influences by Yuu-Yuu-Hakusho despite one dealing with a human gaining supernatural powers and another who is a demon hybrid. The characters in both series are quite colorful, but the demons stand out as being unique as well rather than run of the mill generic like some other series.
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Recommended by Yemi_Hikari
These two anime feature battles between different factions of demons with each character having their own special powers. The protagonist from each is (mostly) human, but is dragged into these conflicts through circumstance. Check out both of these for the Shounen action and the diverse cast of characters.