Koya was Shredder's pet falcon, who he used for reconnaissance. She becomes mutated sometime following City Fall and ambushes the Turtles and their friends at April's parents' farmhouse during the Northampton storyline. She is expressive, and is excited and eager to hunt down her prey. She and Bludgeon have a brother/sister-like relationship, and they look out for each other. In the Vengeance storyline, Leonardo defeats her by slicing off her wing feathers, apparently leaving her unable to fly. After her defeat, Koya leaves New York City with Karai and Bludgeon.