Demise (The Legend of Zelda)

A while back, I searched for a Pure Evil villain who wasn't a sadist, who wasn't a psychopath, and who wasn't a Bad Boss. Mephisto from Ghost Rider fit that, actually, as he was in neither category and even treated his subordinates nicely. Until I saw Demise. Not only was he in neither of those categories (if only because his only minion was a submissive ass elf who said he'd give his life to him, preventing him from being a bad boss), but he isn't even an egotist like Mephisto. And, not only that, he is neither delusional or card-carrying. And, he is respectful to Link, even if he curses his soul. And, he does ALL this while not being enigmatic (which I would assume would contain a lot of villains like this). In conclusion, I can reasonably say that Demise is the most reasonable Pure Evil, though its likely more examples of the first three criteria exist.