Like his son, Stinky Planesfield is a 2-dimensional stickman, meaning he is flat. It is also likely that he shares the same traits with his son and can also morph into flat surfaces at will. In fact, he looks like his son only larger, with a mustache and thicker eyebrows.
It can be assumed that he is just like Sticky, but less shy and more firm in his actions. He also seems to be on excellent terms with his son. Ever since he lost the fight because of Richard's distraction, he also seems to be antagonistic, cruel, selfish, murderous and power-hungry who was planning to get revenge on Richard and then capture the Evil Turtle and takes him into the Pest Controller.