Aston is a character of few words, he doesn't talk a lot in most times. Aston has undertaken the Alaya-Vijnana surgery when he was a Human Debris. He served as a mobile suit pilot under the command of Kudal Cadel from Brewers space pirates. When Brewers were defeated by Tekkadan, the group's surviving human debris were offered a place in Tekkadan by Orga, and Aston accepted the offer.

Later on in the second season of the anime, Aston became a close friend of Takaki Uno and his sister.
(Source: Gundam Wikia)