Oni

The Oni were 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. It is unknown if they are still alive by the time of 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 against 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.

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 were the first evil to exist in the realms.
 * According to a European Ninjago magazine, the Oni have mysteriously disappeared from the Realm of Oni and Dragons.
 * The Iron Baron and his Dragon Hunters have never seen an Oni, so they mistook the ninja for Oni.
 * According to the Iron Baron, Oni are shapeshifters

Gallery
Oni