Dr. Slawter is an old man, thin and slightly stooped. He's nearly completely bald, and his scalp has age spots. He wears a white lab coat over a red sweater and a white collared shirt. Like Dr. Watts, he has the appearance and personality traits of a stereotypical mad scientist.

Dr. Slawter has two distinct sides to his personality - his morbid side, and his paranoid side. It is heavily implied that Slawter uses ethanol from his laboratory as a recreational drug, and the ethanol.