Doctor Simon Feck was a fairly average looking fellow. Black hair, green eyes, usually in a lab coat and wearing glasses. He was a bit on the thin side as his research sometimes made him forget to eat.

Dr Chimera on the other hand appears to be a man in a trench coat, goggles, gloves, hat, and covered with bandages. Much like the invisible man. Expect in this case, you can see something changing and moving under the bandages. Maybe you spot scales, or fur, or a shell emerge from under the cloth wrappings. Just as quickly they withdraw into the man's body and appear elsewhere on him.