 If you liked
Bastard!! Ankoku no Hakaishin
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 ...then you might like
Chivas 1-2-3
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If you liked the main character in Bastard you will also like the main character in Sorcerer on the Rocks (Chivas 1-2-3) as they are almost the same. That attitude, mind and absolutely overwhelming power is there as well. The world in which these series take place is also almost identical dealing with wizards and magic.
Bastard is a bit longer as Chivas has only 2 episodes but non the less as they are very similar if you liked one of them you will enjoy the other.