What can I say - Murphy was great!
He's your stereotypical old guy, taking no nonsense from the young 'uns, and still managing to kick ass when needed. He definitely gave off a father typre figure and it doesn't surprise me that was how Kiera and Potter viewed him and took to him as.
In my opinion, there should have been a past scene into Murphy's past in this series, just so we can see what happened with his two chiclren, and be better acquantied with his feelings. But still, it was great knowing what we know of him anyway.