User can transform the bodies of others into elements. Target may become a hybrid between their normal state and their element or become an entity of living fire in a pure elemental form.
When her elemental powers reached its peak, Princess Bubblegum (Adventure Time) was able to turn everyone and everything around her into candy, as well as make them more sweet in behavior. She was also shown to be able to convert even other Elementals.
When her elemental powers reached its peak, Patience St. Pim (Adventure Time) was able to turn everyone and everything around her into ice, as well as make them more depressed in behavior.
When her elemental powers reached its peak, Flame Princess (Adventure Time) was able to turn everyone and everything around her into fire, as well as make them more enraged and blood-hungry in behavior.
As a god associated with fire, Hades (Hercules) was able to imbue the Caucasian Eagle with fire...
...turning him into an incredibly powerful fire-bird.
Cryonax (AD&D) can turn anything into ice, including transforming living beings into ice creatures because of his nature as the ruler of the elemental plane of ice.
The Spirit of Water (Elementals) granted Rebecca Golden water transformation powers, turning her into Fathom.
The Waterfall of Watoomb (Marvel Comics) transformed Nicolette Giroux into the air elemental Exemplar Tempest.
Eater of the Mera Mera no Mi (One Piece) obtains the power to create control and turn into fire.
Eating the Pika Pika no Mi (One Piece) gave Admiral Kizaru the power to create control and turn into light at will.