Who is Gaspar from Lamb: The Gospel According to Biff and what is their importance?

Gaspar is the second Magus that Joshua and Biff visit. He lives in a Buddhist monastery in the mountains of China. Gaspar teaches Joshua to let go of his ego, which results in Joshua becoming invisible. The Magus also teaches kung fu to both Joshua and Biff and introduces them to the yeti, with whom Joshua spends much time. In the end, Gaspar must admit to being partially a fraud.