Charms

Quote :

If Transfiguration involves changing the properties of an object, Rowling has described Charms as a type of magic spell concerned with giving an object new and unexpected properties.[20] Charms classes are described as notoriously noisy and chaotic, as the lessons are largely practical.[OP Ch.18] Many of the exposition sequences in the books are set in Charms classes, which are on the second floor of Hogwarts.

This had always seemed like it would be a very fun and very useful class. It would probably end up being one of my favorite classes, because you learn cool stuff.