Like most Sonic.exe incarnations, Needlemouse manifests as a corrupted sprite of Sonic the Hedgehog, often in horrifyingly supernatural ways. In Needlemouse's case, she appears with a more purple or pink hue to Sonic's usually blue fur, likely reflecting the color of Sarah's sweater, while Sonic's white gloves usually end up with a yellow or orange tone, and the peachy skin tone becomes much paler. Supernatural corruptions of the sprite include turning Sonic's eyes into larger, red irises.