I personally don't believe in "Satan".. Only evil. And I also believe a small ammount of evil is human nature. That is to say that everyday, well all make decisions weather to be on the side of wicked or righteousness. How evil one decides to be has nothing to do with what they watch on TV. What it does have to do with, is how they are allow themselves to be psychologically influenced by what they see.
And even religiously speaking... unless its a satanistic anime... its not satanism.