Sinnoh is a dark, purple-tinted entity heavily resembling the look of the Freddy Fazbear animatronic. Unlike his basis, Sinnoh lacks arms or legs, having a wispy tail in place of the latter. While most of his face is barely visible, his eye pupils and teeth can be seen glowing in the dark. Throughout most of his directional poses, they shapeshifts into twisted and nightmarish versions of his base forms. Sinnoh also can change into the popular mascots of fazbears freddy, bonnie, chica, and foxy.