Ghost

Ghost is the alternate form of Comet. His species, Comet Cats, change into an alternate form when overcome with strong negative emotions. Ghost is that alternate "werewolf" form to Comet.

In this alternate form, many things change. The most obvious being their coat patterns and visible biology (such as the star on Comet's forehead becoming a third eye for Ghost). The Cat's star on the end of their tale moves somewhere else on their body (in Ghost's case, it moves to his chest). Where the Cat would usually be sustained by fulfilling wishes and bathing in starlight, in this alternate form, they gain a drive to hunt and require food to sustain themselves like any normal cat - however if this urge is ignored, they could become overcome with hunger and unable to control themselves. This form is temporary and not necessarily a bad thing, it's simply a manifestation of a Comet Cat's emotions.