He was very loyal to the Institution, which was helped by his naivete that allowed him to ignore the terrible things they did. He was also proud and easily led to anger, Ambrosius "hates to lose", and when Ballister beat him at the joust, Ambrosius shot Ballister with the lance, securing his position at the Institution, it happened years ago. Ambrosius was overly dramatic, playful, pompous, and treated it all like a game. He disliked killing. He still liked to hang out with Ballister. 