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Yu Yu Hakusho, it's about a 14 year old boy that gets killed and is revived by the ruler of the Spirit World (a god) to become a Spirit Detective. His job is to protect the human world from troublesome demons and evil humans. If you read manga the manga is much BETTER than the anime, but he anime in this series is good to. There are four seasons, first which revolves around the boy becoming Spirit Detective and he makes some friends both human and demon. The second his called the Dark Tournament (a demonic martial arts tournament) where the main character and friends fight against demons for their very lives. The villain is a mega strong hanyou (though not a natural hanyou like Inuyasha, this one is physically engineered by choice of his own). Third the Sensui saga, where they go up against a deranged super powered human that chooses to side with demons against humanity, and forth is the Saga of the Three Kings which involves the Demon World, my personal favorite :D
You can watch all the episodes here, or down load them, just make an account and you're good to go :)
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