Stolen Identity

Hi everyone. Imagine that someone was able to steal not only your credit cards and bank account but your whole life, your entire existence. Maybe the thief creates another identity for you to discredit you should you try to report this. I will play any character in this: the victim, thief or a third person who only half-believes the story. I feel like magical or sci fi elements would do well here. Physical appearance changes, body swaps, lost or corrupted memories, whatever...might help this work better. I am leaving much of the details open for discussion. Send me your ideas!