User blog comment:Prime ShockWaveTX/Your Top 10 Most Vile Villains from Villains Wiki/@comment-4851935-20150120125638/@comment-1762629-20150122065832

No, most versions of Satan aren't Monsters- given your statement directly afterwards, Robinson, I'll assume that was a little typo. Since the Devil is arguably the  definitive face of evil, there are countless dozens of portrayals of the Devil, blatant expy or not, across several forms of media, a lot of which are played for parody. I can only count a few that can truly be regarded as Monsters.

The original as depicted in the Bible, source of all evil and corruption or not, has two major strikes against him. Firstly, "source of all evil" actually works against it; the Devil is likely a physical representation of it, i.e. unable to exercise moral choices as a force of nature. Even without that, the Bible, as one of the oldest works of all time (fictional or not, I myself am an atheist) is subject to several different interpretations and portrayals. Satan himself is consistently portrayed as the evil spear-end to God and Christ, but aside from that his character is vastly variable and shrouded in ambiguity. Several say the Serpent is Satan, and while given the Devil's status as one who corrupts, as far as I know it's never actually explicitly stated. So, being the ultimate force of evil doesn't actually guarantee being a Complete Monster. One has to actually meet several qualifications, based on the work's standard and the basic qualifications, to apply. It has been done with the character (End of Days and Castlevania come to mind) but most don't actually count, and that goes such for the original. This also applies to Adolf Hitler and any fictional portayals of him in media. Just because a figure's evil in real life doesn't meet they can meet the deep end of the spectrum in a fictional work, too.

That said, a Satanic Archetype or an Anti-God (Expy of the Devil or not) can work as a Complete Monster if done right, take Morgoth for the best example.