Ammon is an Egyptian mummy who is more than 3,000 years old and, in his original life, served as a guard for a princess who looked and sounded much like Quinn. He believes that Quinn is the reincarnation of the princess he served in life. He still insists on being Quinn's bodyguard, much to the chagrin of her parents, Jake and Helen.
At present, he has been shown to be impervious to both bullets and bludgeons, but he has been shown to be susceptible to fire. So far, he only speaks in Heratic, an ancient language that both Daria and Quinn are trying to learn.