Falcon

The Falcon initially appears to be a simple bird of prey, but quickly forms a bond with Zane, leading him and the other Ninja to new discoveries.

Later in the series, the Falcon is revealed to be a robot, created by Dr. Julien as a companion for Zane, who was a robot himself. From then on, it became a direct ally of the Ninja, serving as Zane's pet and a long-range scout.

In Season 5, the Falcon was updated to have a shiny titanium exterior, similar to Zane when he becomes the Titanium Ninja. Why it was updated is a mystery.