NOVA's official artwork
NOVA is a wish granting robotic comet, which can only be summoned by gathering the power from the Dream Fountains on the planets surrounding Pop Star, first appearing in Kirby Super Star. (It was renamed Galactic Nova in Kirby Super Star Ultra). It apparently cannot distinguish good from evil, nor does it matter who summons it, as Marx made a wish to control Pop Star after Kirby summoned NOVA.