I remembered reading that a personal or social planet that is retrograde at the time of birth (other than the Sun and Moon as they don’t go on retrograde) suggests that the expression of that planet is unusual, non-mainstream. And then I read that I shouldn’t pay too much attention to the outer planets if they are retrograde at birth as they are in retrograde motion most of the time anyway.
Today, it struck me that the description of retrograde as being out of the ordinary and unusual fits the energies of the outer planets i.e. Uranus, Neptune and Pluto very well. They are unusual, strange or taboo aren’t they?