Elementor

Original Series
A creation by Bio-Constrictor that appeared as a reptillian bird creature that had the ability to mimic different basic elements, enabling him to transform into anything that he had absorbed. He returned in Turbo missions.

Reboot
The Elementors were a group of four Ultralinks that each represented one of the four elements that they assimulated: Fire Elementor, Air Elementor, Water Elementor and Earth Elementor. Due to an accident while escaping from the N-Tek facility, they accidentally merged together to form Ultimate Elementor. Later on, having failed on an attempt to capture Steel, they were absorbed by Metal Elementor to become Mega Elementor, with Metal being the dominant personality.