Dussel’s actual historical name is Fritz Pfeffer.
Alfred Dussel is a fussy old dentist and Anne’s roommate in the Secret Annex. He doesn’t respect Anne at all; he demands Anne’s compliance with all of his absurd wishes while never considering hers. He is generally very selfish, never thanking the Franks or van Daans for sharing their hiding spot with him or showing any gratefulness to their protectors. He frequently endangers the other members of the Secret Annex by breaking their security rules and even hoards food, which he refuses to share. Overall, he fights with everyone in the Secret Annex and often gives people the silent treatment. Anne paints a very negative picture of this fellow.