Myū

Myū (ミュー, Myuu) is a yōkai — specifically a crossbreed between a and a  — that dwells within the Beast Realm. She is known for her mischievous nature, and natural ability to cross between the Beast Realm and Human World with little to no issue. While Soul Society regards Myū as a general nuisance, she is one of the stronger non-Shinigami entities to pass trough into the World of the Living without any sort of limit to their powers, and thus poses a threat to the Human World due to her powers.

Trivia

 * The bakeneko and the nekomata are technically two distinct, though the origins of both can be very similar in folklore.