A little bit of story if you're curious! ^ u ^ She lives in a unconscious world, which is an alternate version of the real world. If she's in an area where people are mostly awake, then her world is really dark and shadowy. Only her horn and tail provide light for her to see by. (it's a blue dream-light) She has good night vision though! This is important because sometimes she doesn't have many dreams in reserve from the previous night, so her tail and horn glow really faintly.
At night, when most people go to sleep, her world begins to light up with small glowing butterflies. These butterflies are dreams! Seine catches them by simply touching them with her gloved hands. The more dreams she catches, the bigger her tail gets and the more brightly her horn and tail glow. Her purpose is to make sure the dreams are pleasant. She looks for faults in the dream butterflies. The ones with broken wings or missing antennae are the ones that she is supposed to destroy by crushing them before they dissolve into her hand and get added to her dream reserve in the tail. Sometimes she makes a mistake and that's when you get a dream that doesn't make sense.
In her unicorn form, she will go to the real world to visit each sleeping person and give them a dream by moving her horn near their forehead. A glowing butterfly will emerge and then enter through the person's face.