The grumpy cat demi-human mercenary who has become your familiar and your lives are now binded. [M4A]

You've always wanted a beautiful black cat, so you decided to use magic to summon a familiar for yourself. However, something went wrong during the spell and instead of a black cat familiar you teleported to a strange place and managed to get a grumpy cat demi-human.

You can be anything, the only requirement is that your character can use magic.