Balthazar's dad is a somewhat anonymous member of Master Payne's Circus of Adventure. His name is never given in the comic, but according to the print novel Agatha H. and the Clockwork Princess, it's Guntar. He also seems fairly shy, as far as appearances go; it looks like the first time we see him is [ here] [[Chronology - Volume #|✣ ]], long after he's first been mentioned, although there's some chance that he's in the background on some earlier occasion.