The nightmare chicken is a minor character on Oobi.
The chicken is an imaginary character who appears in Uma's dreams. It is first seen in Uma's nightmare as a gigantic, scary silhouette that Uma can't identify and mistakes for a monster. It starts to walk toward her as a loud stomping sound plays. She is stricken with fear and wakes up before it reveals itself. When she falls back asleep, she uses a magical chain to turn her nightmare into a brightly-lit sunset scene. The "monster" becomes a chicken, and she dances with it.
It is a fair-skinned hand puppet. It has a red comb and dark brown eyes similar to Oobi's. Four fingers act as its upper beak, while its thumb acts as its lower beak.
The nightmare chicken appears in one episode of Oobi: "Uma Dreams!"