Youkai are supernatural creatures from Japanese folklore, often depicted as spirits or monsters. They can take various forms, ranging from friendly to malevolent, and are known for their unique characteristics and abilities. Some youkai are based on animals, while others are inspired by natural elements or human emotions. These beings play a significant role in Japanese culture, appearing in literature, art, and festivals. Youkai are often associated with specific locations, such as rivers or mountains, and are believed to influence the environment and human behavior. Their stories serve to explain natural phenomena and teach moral lessons.