The Druid Master of Hogwarts

Those who use druid spells to become bears are called bears. Using druid spells to become a moonkin, it is called a bird. Then the use of druid spells to become humans, of course, should be called human virtue. This is a story about a kitty who accidentally obtained a druid spell from another world, and was mistaken for Animagus by wizards, learning how to live a human way in Hogwarts. What can a kitty be wicked?