Transformation
From The Character Database
Transformation refers to the ability to change parts of one's body or modify their form through various means, such as external power-ups, gradual mutations over time, or limited/uncontrollable changes in form. This also includes characters with a restricted number of set transformations.
For characters who can freely transform their entire bodies to assume different identities, impersonate others, and modify their forms at will with high versatility, refer to the Shapeshifting page.