Oni are mythical creatures from Japanese folklore, often depicted as large, fearsome demons with horns, wild hair, and sharp claws. They are typically portrayed in bright colors, such as red or blue, and are known for their strength and mischievous behavior. Oni are commonly associated with misfortune and are believed to bring bad luck or illness. In traditional stories, oni are often seen as antagonists, causing chaos and terror in villages. However, they can also serve as protectors in some tales, warding off evil spirits. Oni are frequently featured in festivals, art, and literature, making them a significant part of Japanese culture.