Hennui has a tall, pale-skinned figure with black eyes and hair with red and blue ombres. His signature attire is a grey shirt with a matching cap, dark grey shoes and pants. He also has a soul patch located on his chin, and he is moderately shown with his head down.
Hennui's cap and shirt are colored purple in his profile in the official Diner Dash Glu Mobile site. This mistake is also added on the map, but with his cap colored purple and his shirt grey.