I have a race of evil aliens in my story, who I feel have to power to be very scary. But they could also have distinct personalities, but giving personalities to them will probably take away the air of mystery about them, and the fear of them will be lessened. For example, would the bogey man be more scary if it observed without a word, or if it had a personality and was very talkative? The personality would probably make them more interesting, but if they were silent then they would be more creepy. What are people's opinions on this?