Kyubey

Kyubey is a quadruped with white fur, tiny pink eyes like a rabbit's, a red emblem on its back, a thick tail, and a body similar to that of a cat, ferret, or dog. Its unique features include long, cat-like ears with floating rings. It doesn't blink; its eyes are always open except when it sleeps. All individuals are identical, sharing the same personality and seemingly the same memories, thus it can be considered a single entity. When it "speaks," its mouth never moves; it likely communicates through thought, displaying a blank face with no gestures.

Being a magical creature, it is invisible to mortals. Only Puella Magi and those with magical potential can see it.

Kyubey is an alien belonging to the Incubator race, who lack emotions and are therefore incapable of generating energy to maintain the universe's entropy. They are cold, logical, extremely intelligent, and calculating, even manipulating anyone necessary to maintain the universe's entropy, thus becoming villains in the eyes of magical girls. He grants wishes and certain magical abilities to human girls and young women in exchange for them making a contract with him and becoming magical girls.

But there's a catch. Although he's always willing to warn them, Magical Girls run the risk of becoming Witches, evil spirits that are imprisoned in barriers and occasionally emerge to corrupt souls.