Elementals are creatures who have mastered abilities related to particular elements such as wind, earth, fire and water. Their appearance differs depending on which element they have mastered.
Blaze is the only known elemental, and he has mastered fire; as such he is portrayed as a being of fire.
The Demi-God Rain is a hydromancer, having the complete ability to control, summon and even transform himself into water. He also has the ability to summon lightning from storm clouds.
Tremor has the powers of an Earth Elemental, and in his Mortal Kombat X ending, his powers become enhanced, transforming him into an Earth Elemental Demi-God.
The Elder Goddess Cetrion has the power of several elements, able to control water, freeze opponents, spawn tornadoes, and summon rock formations and magma, similar to Tremor.
In the story mode of Mortal Kombat 1, characters such as Raiden, Scorpion, Smoke and Sub-Zero have Kameo Fighters of the Lightning, Fire. Wind and Ice elements respectively.