>>6816497What about people who are changed by a magical event?, often through no choice of their own. Perhaps it's you who need to read more, for example in the Rivers of London books where the character is learning magic in modern day London he often comes across people who have been changed by an event or by proximity to other magic. They were not born with or learned magic.
It is an excellent series of books, that really push the boundaries of magic into the modern real world.