Falon Grey was a Jedi Knight and apprentice of General Rahm Kota of The Rebel Alliance. He is one of the six heroes who hasn't appeared in any canon media.
During the mission on Kamino, Grey had been wounded and was treated at the Kamino Facility to heal however the Kaminoans took some DNA and Clone of Grey, naming them X1 and X2. During the Jedi purge caused by the The Emperor, he blamed himself for not seeing it quickly enough. Grey went in hiding on the planet Dantooine among the farmers. At some point The Empire found out and launch a assault with X1 and X2, who were now Stormtroopers, in the Empire. X2 had encountered Grey, but wanted no part in assault, so he helped Grey in fighting against The Empire's Invasion. X1 had approached Grey and had engaged in a Lightsaber duel, but in Grey's point of view making peace with your enemies is right, so he tried to make peace but was shot by a blaster by X1 and had shot X2 as well. Grey had the power to heal by the force, and was able to heal X2 and had sacrificed himself. X2 had honoured Grey and named his squadron after him. Rahm Kota had remembered his apprentice as a dedicated and helpful man.