Greg is able to change all objects and beings into other objects and beings, although the more complicated the object, the more difficult he finds the transformation. Also, the more familiar he is with the object he is transforming something into, the more similar and successful the transfiguration is. At first, he was only able to transform objects, but has he grew more advanced with the ability, he gained the capability to change himself and other people into various objects, and also into other people as well. However, he needs to know any person he is transfiguring someone into, just like he needs to be familiar with any object.