The Doctor exhibits two distinct sides of his personality: a calm and composed manner, and a impassioned, sadistic side. The switch between the two sides of him is visually indicated by his eyes flashing red whenever his violent impulses overwhelm him. Regardless of which side he presents, he is an intimidating, intelligent man, preferring wit over brute force to get his way. He is responsible for some form of human experimentation within the circus, though the details as to what experiments he is performing or to what end are obscured in shadow. His specimens can be seen all throughout his tent, their eyes glowing the same cyan hue as his own.
Speaks in measured, bedside-manner bursts; habitually uses careful phrases and short reassurances before drifting into technical detail.
