Kyubey

Kyubey(キュウベKyube)is one of the main antagonists in Puella Magi Madoka Magica x Yuki Yuna is a Hero

Appearance
Kyubey is a small, cat-like creature. It has white fur and four ears, one pair representing the average cat and the other similar to those of a rabbit's. It has red eyes and golden rings around its long ears. At the bottom of the ears, it appears that it is separated into three, along with a pink-white fade and three red ovals. These ears seem to be what turns the girls into magical girls, as seen when it makes Sayaka Miki's gem. It has a large tail and pointy ears, the inside of them being dark pink. On its back is a red egg shape that is able to flip open to remove grief seed fragments.

Biography
Kyubey is a creature who makes contracts with young girls to turn them into "magical girls" so that they can fight witches. In this process, the girl makes a wish and Kyubey grants it, but in return, the girl's soul is put in a small gem, which is also the source of their magic. If destroyed, the magic will disappear and the girl will die. If it turns black as Sayaka's did, the gem will turn into a grief seed and the girl will turn into a witch.

Much like the rest of its race, Kyubey does not possess any human emotion. As seen in a later episode, Kyubey refers to magical girls' bodies as empty shells while explaining why Sayaka "died" when separated from her soul gem. This may also be why Homura Akemi got angry when Madoka Kaname threw it. Kyoko Sakura claims that it tricked and turned them into zombies, though it wasn't its intention. It believed that it was doing a good thing, seeing as it was convenient that they were basically invincible.

Despite its emotionless attitude, it apparently likes hot baths and human food, as seen in episode 2. It is also able to bleed, though it can reproduce its body and eat the old one. This body reproduction ability can be used whenever Kyubey's body is too damaged to be used or simply at an inconvenient state. (For example, being shown covered in bullet holes from being shot at.) It has an unlimited amount of these extra "bodies" that could be used, but it says that it would be more convenient to not use them so much.