The owner of the costume shop was a lonely man (As we can see, he was staying alone). But he had terrific hearing sensation, this we can see when suddenly stops when the invisible man makes only a slight noise. He had his own revolver from which we can understand that he is a person who cares for protection from others. He was also a little short-tempered person. He was not frightened when he heard the noises,instead he became more aware of his surroundings.