Hamilton is an older man, hunched over with a walking cane. He has short grey hair, blue eyes, a wrinkly face and a pointed nose. He generally wears his lab coat over his grey plaid shirt and black pants and always wears 'old man shoes', square tipped, black, rubber soled shoes.
Hamilton is usually calm, collected and can often be the voice of reason, but he has an obsession with uncovering the mystery of the Lights and the power of the Giant. All other things are irrelevant to him, human lives, and the personnel beneath him.
He also holds an obsession with staying alive, which may be the core reason for his obsession with the lights.