Balgin
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You know there was a series of about 3 products for 3rd edition that covered Diablo 2 pretty well. One was the 3.5 reprint of a 3.0 product and the other was just random item generation tables. That one was called the Diablerie. I can't remember what the main campaign book was. I think there was a version of The Butcher in there that might be a good point of reference.
As for a base creature I'd say somewhere between ogre and hill giant. Given Pathfinder's ogre's tendency towards cleavers and savage butchery I'd say it would be a good match.