MC has cards that do this already.
Giving the girls traits means that you do not need to juggle their cards, as much, to satisfy Sofia.
MC cards don't really need much juggling, if any. OK the Fortune Teller is useful, once per guest, per level. The Seer is useful, whilst you're collecting the cards. But you don't need to juggle them around, anywhere near as much as you do for the girls.
My MC has The Chosen One, The Visionary & The King equipped.
I don't have any reason to switch those cards, so adding those traits for MC seems rather superfluous to me.