Balthazar is a small boy who's part of Master Payne's Circus of Adventure. He's very important to plot development, as Agatha's first contact with the Circus comes when she him lost and up a tree, and delivers him to his mom, Trish Belloptrix. They and the other Circus people take a liking to her (and Krosp, who's involved in the discovery but isn't sure whether they should rescue the kid or eat him -- eeuuwww!) and feed her a meal, setting in play all manner of merry adventures.
He plays the role of general camp gofer, for example taking Smilin' Stev out to collect firewood. This too is important to plot development, as Agatha's close inspection of Stev is her first hint that there may be more to the Circus than meets the eye. Another contribution he makes to the plot is donation of a moderately cool coat that he's outgrown to Krosp.
He is also fond of quoting some of the more embarrassing statements made by his father. For instance, upon his first encounter with Agatha and Krosp he says, "Just passing through like cheap beer."
Possibly Significant Outside Information Edit
Balthazar, which comes from the Phoenician Balat-shar-usur for "Baal protects the King," is considered to be the name of one of the three Wise Men of the East and is a name Shakespeare used in several of his plays for several key supporting characters. As Romeo's valet in Romeo and Juliet. Portia's masculine alter-ego in The Merchant of Venice. A follower of Don Pedro and a singer in Much Ado About Nothing, and a merchant in The Comedy of Errors.
Balthazar is also the Babylonian name given to Daniel in the Jewish book of the same name, who was quite possibly the greatest prophet of all time. He served several emperors of both the Babylonian and Medo-Persian Empires, and at one point was the most powerful person below the emperor himself. He is also the one who deciphered the "writing on the wall", predicted the fall of the Babylonian Empire, the rise, fall, and characteristics of the Medo-Persian Empire, the Greek/Alexandrian Empire, and the Roman Empire, the division of Alexander the Great's empire and the activities of his successors, accurately predicted (to the day) the dates of both Jesus' birth and his triumphal entry into Jerusalem, and most likely founded the order of which the Wise Men were members.