Frankenstein's Monster was a complex and sickening individual. Created from the midst of Victor Frankenstein's madness and abandoned by his creator, he'd disappeared after he was abandoned to learn the ways of the human race. After two years, he interrogated his creator, and demanded him for what he wanted most - a mate, in return for him not killing every single person he loved. It was a price for him to pay for creating him, and he resented Victor with a burning passion, so he meant it.