Full Idea
Nietzsche's view (which we may call the 'Doctrine of Types') is that each person has a fixed psycho-physical constitution, which defines him as a particular type of person.
Gist of Idea
Each person has a fixed constitution, which makes them a particular type of person
Source
report of Friedrich Nietzsche (Works (refs to 8 vol Colli and Montinari) [1885]) by Brian Leiter - Nietzsche On Morality 1 'What kind'
Book Reference
Leiter,Brian: 'Nietzsche On Morality (2nd Edn)' [Routledge 2015], p.6
A Reaction
An interestesting variant, standing between the Aristotelian picture of one shared human nature, and the existentialist picture of our endlessly malleable nature. So what type am I, and what type are you? How many types are there?