When one character forcibly and deliberately swaps bodies with another. There are two main versions of this: * In the first case, the goal is to "upgrade" one's body; an ailing character (dying, elderly or disabled) swaps bodies with someone who is young and healthy, or a Muggle swaps bodies with a super-powered person, or both. * In the second case, the goal is to deceive the rest of the world; a character who is imprisoned or wanted for heinous crimes swaps bodies with an upstanding member of the community, or at least someone without a rap sheet. This version does not necessarily require swapping bodies -- all they really need to do is find a way to look like the person, research that person, then kill them and take their place in society -- but a body swap just makes that last st