I think a Death hero who swings around a coffin would be cool. Maybe with a new faction of recently deceased people who desperately hunt souls to replace their own lest they be reaped by Nagash and tormented in far worse ways than they currently suffer. Like a reverse FEC where they're horribly aware of their undead nature but try to appear as alive as possible. Also the recently-departed thing could be neat where they cover up obvious wounds or use the very weapons that killed them.