Meepsworth here, just gonna say: Now that I think about it, technically no character is an OC. Sure, a character that contrasts another in some sort of way does make it original, but if you were to break something down and nitpick it bit by bit, it would be unoriginal. Pixel art, pink slippers, blue hoodie, dark aura, red eye, just think about it.

Description: Practicing Sprite Work, Replicated Sans' battle sprite.