Transformation users are characters that can only slightly modify their forms through external power-ups (such as Mario), ones that simply mutate over the course of a storyline (such as Acacia from Toriko), or ones that have limited or uncontrolled transformations (such as Saiyans from Dragon Ball, or werewolves and vampires from folklore).

For character that can freely transform the shapes of their bodies to assume almost any different identity, for impersonation purposes or otherwise, please use the Shapeshifters category instead.