She brings nightmares related to the emptiness of space. The inescapable void, the inability to call for help, the instant, suffering and cold death, and whatever monsters there could be out there.
Of course with all that she is absolutely terrified of space. She can’t think about it without getting anxious. Maybe making the humans also terrified of it will help them not go?
Nata is a very fidgety and paranoid kind of girl, she doesn’t like getting out to give nightmares a lot, since that implies getting off the floor and looking at the stars. She tends to get into accidents and hurt herself, mostly for not looking where she is going while being panicked.