Tengu

""Centuries ago, a great battle was fought between the Ninja and an evil bird demon: the Tengu. The demon was too strong to defeat until a ninja found the source of the Tengu's great power. The demon feathers infused the Ninja suit with mysterious powers. Upon defeating the Tengu, the Ninja imprisoned it in a sacred stone. It can only be released by the hand of Ninja. The Tengu and the Ninja are forever linked, their strengths are shared.""

- Excerpt from the NinjaNomicon

The Tengu is an evil bird demon from the Disney XD show Randy Cunningham: 9th Grade Ninja. It was imprisoned in the Eye of Eternity by the First Ninja, and it keeps the Sorcerer trapped under Norrisville High.