Franz Argentblum is the son of the owner of the largest chocolate manufacturer in all of Europe who is also a supervillain. He is also the heir to this great estate, and with all that chocolate, it could be said that he is a bit overweight. Identifyable by his large size and his thick German accent, Franz will be joining his peers, Nigel (who becomes his best friend), Otto, Wing, and co. in great adventures at H.I.V.E.

Franz and Nigel are often bullied by Block and Tackle, who are members the Henchmen stream.