Just a quick response to your first area of inquiry: Wittgenstein accounts for selfhood and individuality in much the same way. These qualities, always provisional, are the result of our constellation of memberships in language-games. This is a form of perspectivism that may be considered more dynamic than even Nietzsche's. Wittgenstein's account of who we are, who we think we are, and the obstacles we must overcome to arrive at a self-definition is predicated on a peripatetic view of the person. Simply: life is a walk through an occasionally lonesome valley.
Christopher Robinson & Joseph Duemer read Wittgenstein's Philosophical Investigations