Zander
Explorer
A few years ago, I co-authored an RPG called Incarnate. The premiss was that the PCs had had past lives and could draw upon knowledge and skills from before they were born. It also meant that PCs and NPCs could know each other from their past lives which added a whole new level of complexity. Imagine if your beloved wife in this life turned out to be your killer in a previous life! The RPG is available free as PDF here.