Character Archetypes!

I am currently reading The Warlock by Micheal Scott. The character I am going to focus on is Josh Newman, one of the twins of legend. He has a golden aura which is supposed to be the most rare and powerful. In the first book The Alchemist, the prophecy written by Abraham the Mage is made as follows; "the two that are one, the one that is all. One to save the world, the other to destroy it." page 26. I think that josh will end up destroying the world. To me, Josh has the archetype of the shape shifter. He is at first with Nicolas Flamel and his twin when he goes with the infamous Dr. John Dee. He says " I believe in a future where everyone is safe, and that will be brought on by the elders Dee is summoning" page 230, The Warlock and in the first book The Alchemist Josh says "I am with you, Flamel." For now I am unsure where Josh's loyalties lay, as he has left Sophie and Flamel to join Dee, but he is very flighty so he very well could return before aiding in the fall of Danu Talis.