Settled with a Feral Dispater Tiefling Way of the Shadow Monk (that's a mouthful). So a... rogue-ish monk, what's with all the stealth, illusion and darkness stuff he gets access to.

It was a tossup between that or a bulkier, life-stealing Way of the Long Death Monk (Levistus' Armor of Agathyst would have been nice synergy). Not sure if I'll come to regret the lack of bulkiness, but RP-wise the other option sounded more fun.

Started on my sheet as well, should hopefully finish tomorrow unless work kills me.