This character has the ability to shapeshift into something else.
Shapeshifting is a common theme in mythology and folklore as well as in science fiction and fantasy. In its broadest sense, it is when a being has the ability to alter its physical appearance. The transformation may be purposeful or not, depending on whether it has been the subject of a curse or spell. In some folklore, once the shapeshifter has become transformed, it becomes progressively more difficult for it to return to its original form.
Unlike metamorphosis, shapeshifting is not permanent and shapeshifter can change back.
This trait refers to changing the shape of the whole body and in that context do not cover partial transformations such as turning one's hands into claws.