Nargles are magical creatures that are mentioned in the Harry Potter series, but their physical form or any solid evidence of their existence remains absent throughout the books. According to Luna Lovegood, Nargles are mischievous and thieving creatures, often blamed for anything missing or amiss, much like gremlins in Muggle folklore. Although they’re never officially described, the idea of Nargles conjures images of tiny, impish beings causing chaos in the background. They are considered to be drawn to mistletoe, a plant used in many magical potions and also a traditional part of Christmas decorations in the wizarding world. Luna Lovegood is the only character in the series known to believe in their existence, and her belief in Nargles is a reflection of her unique outlook on the world. Lunas Guide to Crumple-Horned Snorkacks, Nargles, and More describes Nargles as creatures with light purple to black skin, two thin arms and legs with long fingers and toes, bat-like ears, large white eyes, pointy noses, and sharp teeth. They are mischievous trouble-makers that live anywhere where they can make trouble, and they often live in mistletoe to attack people kissing underneath. They are classified as XX, which is the second level of dangerousness.