Beauregard is a highly intelligent demon in Xanth who is writing a doctoral thesis on the supremacy of demons over other lifeforms entitled "Fallibilities of Other Intelligent Life in Xanth". Once owed a debt to the Good Magician Humfrey after seeking information from the Good Magician on other lifeforms. He served time in a small vial for Humfrey, answering questions for people. He stayed in the vial to gain further information.
Beauregard met Good Magician Humphrey at the Demon University, where they became friends and greeted each other with insults.