A Kneazle is a magical feline creature, related to, and similar in appearance to a cat. They have spotted, speckled or flecked fur, large ears and a lightly plumed tail, like a lion. They are thought to have separate breeds, like cats, and therefore vary in appearance. They make excellent pets or even magical familiars if they like a witch or wizard. They have a very high level of intelligence, are independent and occasionally aggressive, and have an uncanny ability to detect suspicious and distrustful people. They can also safely guide their owner home.

quoted from the Harry Potter wiki page about Kneazle's

I took two of my characters (Moro and Ian) and developed a new side-story for them in the HP universe. (They have plenty of AUs, btw.)

Moro has a kneazle mix breed oriental shorthair cat as pet, which you can see in this picture.
I think an actual kneazle's ears might be even bigger.

... yeah this is not an actual kneazle, just a mix-breed and very much my own version of what such a mix would look like :B