Magicat

At a first glance, magicats appear as normal house cats, but upon closer inspection their fey nature can be discerned. They possess magical abilities such as teleportation and mind-reading, and their purring can lull people to sleep.
Some people have unknowingly invited a magicat into their homes. If treated right, the magicat can bestow many boons to the household, but if wronged, they will wreak havoc. Some mages have managed to make magicats their familiars. Magicats can talk through telepathy, but they rarely feel the need to.
The fey folk call magicats "Cait Sidhe". In its natural habitat in the Faerie Realm, its coloration is a swirl of psychedelic tones.