In terms of personality Vaun is as you might expect in some ways of a inexperienced youth. Sure he knows best, yet hesitant to take up the reins and lead for fear of failure. His inexperience leads him to question his own abilities, yet he still has a sense that he knows best and some arrogance as a result. It is at times a paradox, and he prefers to follow while amongst the largely older adventurers rather than face it. He is kind to those less fortunate but quick to blame or suspect authority. This comes from his own personal experiences in his youth, and a zealous need to serve and defend his own faith. To this end he may be merciful to a follower of Cyric, or someone lead astray by the teachings of Bane, yet when faced with a corrupt member of his own faith, someone who violated an oath to Siamorphe, he is ruthless.
He holds followers of Siamorphe, and to a slightly lesser degree nobles in general, to a higher standard, and is less forgiving when they fail to meet them. This perhaps aids him in his duty, but could potentially cause issues down the road.