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I will preface this by saying I am a huge procrastinator and will never end up writing this. But I've been mulling a story for almost 20 years in which the main character changes bodies at will. Not a polymorph - the character is a consciousness that moves from body to body.
Sounds like Kaiba, except there many/most people can switch bodies. https://en.m.wikipedia.org/wiki/Kaiba
