Oreste

So, he's cool looking right? Yeap. But what has he got to do with Kieran? Believe me, nothing. He got more to do with the fairies than with Kieran. Wait... Did I say he got to do with the fairies? What? What is a human doing related to the fairies? Isn't the fairy race hidden far away from the knowledge of humans? Yes and No.

Apparently Oreste is a descendant of witches. They have been feared by the humans for a very long time especially in the 18th century. However, witches are humans themselves. They only have this fearful abilities like longevity and healing because they consult with the magic powers of the fairy race. In return for secrets to longevity(what most people would want), they are to keep all secrets sealed and do the bidding of the fairy race. They are like agents for the fairy race. They live among us.
Oreste is a modern wizard though. His weapon of choice fires energy bullet created by magic. Hence, a deadly and almost flawless murder weapon of choice.(the magic dissipates once asked to).

But of course there are slight disadvantages of becoming a witch/wizard. Though you get to live to 250-300 years, they can only give birth to children with only witches. Also, the witches can only give birth to a single child every decade. So, obviously living long isn't all that good for people who like children a lot.

Enough said. Oreste is but only one of the countless witches and wizards that walk among the modern human population.