This "protean capacity" of the self is virtually a new structure in mind, brain, and psyche, for it grants us the capacity to view ideas and systems--be they social, intellectual, political, philosophical, or spiritual--with a freedom not always accessible in the past. ... release all kinds of capabilities and potentials .... (Protean Ventures)
Psychiatrist Robert Jay Lifton seems to be the person most closely related to the concept of a protean self. This is derived from the mythological figure Proteus who was a constant identity-shifter, never stable long enough as one entity to speak the truth sought of him. Lifton's idea is that in this post-postmodern world, flexibility of identity, without psychologically pathological fragmentation of personality, is a virtue, not--as formerly seen--a weakness.
The contention is that this flexibility, this ability to personify the "other" of society, of your "stable" personality, opens you to new levels of expansion and opportunity that is not otherwise available to you. So, for the protean self, the answer to all your questions would be "yes." Yes, I am invested most in people and most in things. Yes, I am most invested in character and most invested in body--yes, broadly and, yes, narrowly. Etc. Perhaps this is the 21st century transcendental meditation. If this is what you are referencing in your question, I am no reference for the "protean self." I am invested in character and invest safely, with minimized risk and, while emotional, I endeavor to base my decisions and choices on logic.