Also known as: ダークウイング
Kamen Rider Knight's Contract Monster.
It has a Bat (Animal)-like appearance and can generate ultrasonic waves, and can also attach to Knight's back, granting him the ability to fly, or transforming into a cape called the WingWall to protect Knight.
When Knight powers up to Kamen Rider Knight Survive, DarkWing also powers up to DarkRaider.