Having no kids and no family makes Mr. Dussel pretty horrible. Or maybe he was horrible before that. Either way, he's a fussy old guy who's got little to no redeeming qualities. He doesn't respect Anne at all, but asks for her respect simply because. He is overwhelmingly selfish, never offering a helping hand or even a thank you to the people who have saved his life. He is only too eager to throw other residents of the annex out so he can have their food.