would a person who can seamlessly adopt the identities of those around them (mimicking occupational or social status, opinions and personalities) to get close to them in order to manipulate them them be a heir or thief or smth else? also what aspect could that be? i was thinkin heart but could it also be anythin else?

Hard to say if it’s more Heart-y or Mind-y, but I think a Thief could work.