Little is known about William Hunter other then some rough facts. Such as his physical description and bits of his character.
Possessing no magical powers or talents of his own, he and his late wife Mary Hunter were able to raise Tim Hunter. William is a roughly six foot tall slightly over weight one armed man.
It's difficult to discern much about his life or job for that matter. But it is easy to see he's a kind and gentle man who is a loving and devoted father. Even if Tim isn't his natural born son.