Exos is the brother of Captain Stratos, Thermos, Tropos, Lithos, and Terra who wants to become a Chaos Lord. He later becomes the first Chaos Knight.
- His identity as the mastermind behind the trouble in the Skyguard wasn't revealed until completion of the Pirate Base quests. Also, he was just named "Master" until then.
- After completing his quests at the Bunker, he is replaced by an Illusion of Exos.