Jack-O-Chica is a boss in Slender Fortress.
The first notable difference is her color designs being completely orange. In place of her normal endoskeleton eyes, the eye sockets are quite brightly glowing orange, much like a Jack-o-lantern. A similar effect appears to have been applied to Jack-O-Chica's overall body, as it can be seen very prevalently around her shoulder sockets and tears. Her endoskeleton head is entirely absent. If one looks closely, they can see that her endoskeleton chest is also absent. Few glowing yellow tints can be seen from her teeth and mouth. The only other noticeable difference is that Jack-O-Chica's feet and lower legs are slightly darker in color than that of Nightmare Chica's. Her bib remains unchanged.
In place of Nightmare Chica's cupcake, a large green Jack-o-lantern can be seen - from the Right Hall (while Jack-O-Chica's moving away when the player turns the flashlight on), the Extra menu, and even its jumpscare in the Bedroom. Interestingly, her Jack-o-lantern is nearly identical to the actual pumpkin from the Five Nights at Freddy's 3 Halloween update where it can be seen on The Office desk. It has triangular eyes and a nose like that of a stereotypical Jack-o-lantern. Its mouth is zigzag-shaped as well. It has an orange light glowing from the inside. It also has large, white circular eyes that glow like a light-bulb, but went absent while Jack-O-Chica's retreating.
In Slender Fortress Edit
Jack-O-Chica is a instakiller like the other animatronics, she can't be stunnable untill she has helpers called, Nightmare Freddy, Nightmare Bonnie, Nightmare Chica, Nightmare Foxy, Nightmare Fredbear, Nightmare, Jack-O-Bonnie, Nightmare Mangle Nightmare Balloon Boy, Plushtrap and Nightmarionne.