Oni

The Oni are a race of demons, mentioned in Season 8. They were the first evil to ever come into existence, as well as the creators of the three powerful Oni Masks. They inhabited the Realm of Oni and Dragons, the first realm in existence. A group of Oni, called the Dragon Keepers will appear in Season 9.

History
Before the existence of any other realms, there was the Realm of the Oni and the Dragon. In this realm existed two races; the Oni and the Dragons. The Dragons had the power to create, while the Oni had the power to destroy, and so they waged a never ending war on each other. One day, however, a child was born, having both the powers of Destruction and Creation. When the Oni and the Dragons fought over which side the child should choose, the child left their world to start a new one, called "Ninjago."

Soon afterwards however, some of the Oni pursued the child to his new realm of existence, creating a temple deep within Primeval's Eye, where they depicted their origins on the walls of the temple. They would also seal away the Oni Mask of Hatred within the temple, which could only be taken by a being with Oni blood.

Thousands of years later, a group of Oni would come together to form the Dragon Keepers, whose purpose is to hunt down dragons for an unknown purpose.

Known Oni

 * Dragon Keepers

Hybrids

 * First Spinjitzu Master (of Dragon descent)
 * Garmadon (of Dragon and human descent)
 * Lloyd (of Dragon and human descent)
 * Wu (of Dragon and human descent)

Trivia

 * The Oni are based on Japanese folklore.
 * The Oni are the first evil to exist in the realms.

Oni