This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Werecat (Worldwide)
A werecat is a mythological or folkloric human with the ability to shapeshift into a wildcat or a hybrid wildcat-like creature, either purposely or after being placed under a curse. They have the power of both a human and a wildcat. Like the werewolf, they can change into a humanoid cat or reverse with a cat becoming human.
The werecat can also be a being cursed by sorcery or by accident, like messing with witches or warlocks, who often have a cat/familiar at their side to defend them if provoked. The origins of Werecats remain hotly debated. Unlike Werewolves their condition is non-transferable; it is simply a trait of certain families, the way that they are.