" Become who you are!”
The misunderstanding of Nietzsche’s point is suggested immediately by the mistranslation: one becomes “what” (was) one is, according to Nietzsche, not “who” (wer) one is. But to speak of “what” rather than “who” suggests precisely the objectification of the person that one would expect from a philosopher who views persons as having immutable, determining characteristics, such that one may ask of a human being, as one may ask of a tree, “What is it made of essentially? "

― Brian Leiter , Nietzsche on Morality (Routledge Philosophy Guidebooks)