Rex Salazar is the main character from Generator Rex and an E.V.O with the power to create a variety of machinery with his nanites, control machines, and cure most E.V.O.s. He is the secret weapon of the international organization known as Providence, which exists to combat the E.V.O threat. Rex's job, along with that of Agent Six and Bobo Haha, is to defeat the more powerful E.V.O.s that appear and cure them.

(Text from FusionFall Wiki.)