Oni is a multifaceted character often depicted in Japanese folklore as a fearsome ogre or demon. Traditionally portrayed with vibrant red or blue skin, horns, and sharp fangs, Oni are known to be malevolent spirits or guardians of hell. Over time, their representation has evolved, with some interpretations presenting them as protective figures or symbols of good fortune. Oni have permeated various aspects of Japanese culture, from literature and art to modern pop culture, symbolizing the complex interplay between good and evil.