I give THUMBS up for MadHatters application aswell. (allready for few soty ideas, as its warlock...)
-> Demonhunter that has to battle against his inner demon(patron, that grants him the powers)
-> That Thiefeling he mentioned in his background..that was slaughtering virgin females..
-> Drakon.. his main nemesis..I was thinking that he might be of lv5 or some such.. not too far of enemy, they might face in relatively beginning, but when they defeat him, his true master makes an appearance..