[@Stitches] Devils might be a bit difficult to play, due to their eldritch and generally malicious nature, but you'd be welcome to try if you'd like. :) They come from Hell, which is no longer ruled by the Prince of Hell in this canon (the Prince's current whereabouts are unknown, and the devils are very eager to find out where he went), and tend to stay in London's Brass Embassy when conducting business there. They don't steal souls, but they offer plentiful wealth and fortune to those who sell their own, and import human souls in exchange for brass and fuel. They aren't picky if the souls that are sold to them are stolen, however.

They're very crafty and charming, openly mingling with people in London. They can befriend humans or even pursue romances, but it's very, very rare for this to be anything but a means to try and swindle a person out of their soul. Does that all make any sense?

EDIT: If you'd like to play a traditional soul thief, you could always play a spirifer, who are humans that steal souls and pawn them off to the Embassy for money and favors.