the.com/personality

means The particular blend of traits, habits, and ways of reacting that makes one person recognizably different from another.

from Traces back to Latin 'persona,' meaning a theatrical mask — the kind actors held up to project a character and throw their voice through ('per-sonare,' to sound through). So the word for your innermost self began as a prop for pretending to be someone else, which is either ironic or exactly the point.