Kuromi

Kuromi is My Melody's rival, who is a white rabbit-like creature wearing a black jester's hat with a pink skull on the front and a black devil's tail. The skull's facial expression changes to match Kuromi's mood.
Kuromi is the "punk" tomboy counterpart to My Melody. Although My Melody has warm feelings for Kuromi, Kuromi's feelings are more inclined to rivalry to look tough