Well, tried to wage war against his boss, Bob, at the risk of losing his cushy position (assertive, stubborn?). When he lost & wound up in Hell he decided to set up his own operation which requires the overseeing of lots of employees and new clients. He'd probably need to be very inventive for all the different types of tortures. Likes to challenge people to fiddle duels so he's competitive. Will buy your soul for a doughnut, so he likes to make bargains.
What's that add up to?
I know a girl, she's one of a kind
But the poor little thing, she's going out of her mind
There's something you forgot - there's a reason why she's lost
Cos baby she don't want to be found
I say INFP. He's not your ordinary "bad guy". I think he's not looking at himself like doing something bad. He's doing what comes to him as right, but that other dude up there doesn't thinks it's right.