Nightmare Balloon Boy is a boss in Slender Fortress
Nightmare Balloon Boy appears similar to the original BB, except with a more menacing design. This includes large, pointed teeth inside of his large mouth (similar to Nightmare Chica), dark-blue eyelids and teeth gums, long claw-like fingers, and more sinister looking eyes with red irises and bloodshot veins. He has a red nose and cheeks instead of orange ones. He also has a red and purple striped hat and shirt, instead of his usual red and blue stripes. The pinwheel from the top of his cap is also blue rather than orange with a yellow button up top. His two buttons are grey instead of the original BB's black ones. His hair is slightly shorter than his original counterpart. His blue pants are lighter in color. If one looks carefully, one can see that Nightmare Balloon Boy seems to wear white socks. Interestingly, Nightmare Balloon Boy appears to be in a perfect and completely undamaged shape.
In Slender Fortress Edit
Nightmare Balloon Boy is a instakiller like the other animatronics, he can't be stunnable until he has helpers called, Nightmare Freddy, Nightmare Bonnie, Nightmare Chica, Nightmare Foxy, Nightmare Fredbear, Nightmare, Jack-O-Bonnie, Jack-O-Chica, Plushtrap, Nightmare Mangle and Nightmarionne.