Oni are monsters from Japan. 

Oni are monsters from Japanese stories. 
They are very strong. They may have horns on their heads. Some have big teeth and claws. They can be red, blue, black, or yellow.
Oni can change their looks. They can trick people by looking like humans. Some stories say they live in deep mountains. 
People use beans to drive them away. They throw beans and shout during a festival. This helps keep bad luck away. 
Today, oni are in many books and plays. They are even on roof tiles. They help protect homes from bad luck.
Oni are famous monsters from Japanese folklore. 

Oni can change their looks to trick people. They can look like a man or a woman. In old stories, they were seen as scary. Some stories say they could eat a person in one gulp. People thought oni brought bad things like storms or hunger. 
Today, oni are part of many fun stories. They appear in tales like Momotarō, the Peach Boy. Some people use oni to bring good luck. You might see oni faces on roof tiles. These are called onigawara. They are meant to protect homes from bad luck. 
Oni are famous creatures from Japanese folklore. 

Most oni look very specific in art and stories. They are usually huge figures with one or more horns. They often have massive teeth and sometimes a third eye. Their skin can be red, blue, black, or yellow. They often wear loincloths made from tiger pelts. Many oni carry heavy iron clubs called kanabō. They may have three to six fingers on each hand and foot. These fingers often end in sharp, claw-like nails. 
The history of the oni is very long. The oldest surviving painting of an oni is from the 14th century. It shows a famous creature named Shuten-dōji. He is considered the strongest and most famous oni in Japan. Many different types of art show his legend. These include plays like Noh and Kabuki. A hero named Minamoto no Yorimitsu once defeated him. He used a long sword called Dōjigiri to do it. This sword is now a National Treasure in Japan. 
Some people believe the word "oni" comes from a word meaning "to hide." This might mean they are beings that do not want to be seen. In the past, oni were seen as very scary. Some old books from the 700s describe them eating people. However, they are also linked to good fortune and wealth. Some people even call very powerful oni "oni gods." In Buddhism, they are sometimes seen as guards in hell. They may punish sinners under the rule of King Yama. 
Today, oni are much friendlier in popular culture. You can find them in famous fairytales like Momotarō. They also appear in games, such as a version of tag. In February, people celebrate the Setsubun festival. During this time, they throw roasted soybeans to drive oni away. They shout to keep bad luck from their homes. You might also see oni faces on roof tiles called onigawara. These tiles are meant to protect buildings from bad luck. 
In Japanese folklore, oni are powerful creatures often described as demons, ogres, or trolls. 
Physically, oni are depicted with very specific and striking features. They are typically hulking figures with one or more horns growing from their heads. Many are shown with massive teeth and sometimes a third eye in the center of their forehead. Their skin colors vary, often appearing in shades of red, blue, black, or yellow. 
The origins of the word "oni" are subject to different theories. In China, the character 鬼 is read as guǐ, referring to formless or unworldly ghosts. However, a 10th-century Japanese dictionary suggested the word might come from a term meaning "to hide." This implies that oni are beings that deliberately conceal themselves. While Chinese guǐ are often seen as spirits of the dead, Japanese oni are viewed as physical beings with substance. They can be physically harmed by Japanese swords and live in the human world.
Ancient Japanese mythology provides a foundation for these creatures. According to the Kojiki and Nihongi, the universe was created by divine beings called Kami. One significant story involves the deities Izanagi and Izanami. When Izanami died, she went to the underworld, known as Yomi, and became a Kami of death. It is believed that she ultimately created the very first oni in this underworld. This connection links the existence of oni to the transition between life and death.
Throughout history, certain oni have become legendary figures. Shuten-dōji is regarded as the strongest and most famous oni in Japan. His legend has been shared through various arts, including Noh and Kabuki theater. 
Oni also play a role in religious and spiritual systems. In Buddhism, very powerful oni are sometimes called kishin or kijin, which means "oni god." These are viewed as wrathful deities. 
Even today, oni remain a part of daily life and tradition. During the Setsubun festival in February, people participate in a custom to drive away bad luck. They throw roasted soybeans and shout to ward off oni from their homes. 
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