Antoine Roald Burton-Fitzgerald (Roald for short). is the father of Rupert and the brother of Mary Finn. He is a Jub-Jub Bird. Roald, Rupert and all Jub-Jub birds in the comic were created by Sfé Monster.
It was revealed in the description of Obverse & Reverse Ch2 Page 8, that his full name is Antoine Roald Burton-Fitzgerald. He has since been referred to as Roald (as opposed to Antoine) by other characters.
Roald resides in Wonderland, studying the high concentrations of magic there and its effects on the ecosystem and its inhabitants.