The charge of a fundamental particle is a mysterious but obvious and well-known property of every non-neutral particle.
I can understand how, if a particle is an object, or thing, for want of a better word, in its own right, then it can have a property of charge, because it would just be a property that's attached to the object (particle).
However, I think it was Brian Cox or Roger Penrose (not entirely sure which) who said in a book or on television, that a particle is just a point of high intensity in a quantum field.
How can it have charge if it's just an intense point in a quantum field? Surely the high intensity couldn't just result in charge.