He is credited as the co-creator of the popular comic book series MegaTokyo.

He has since parted ways with partner Fred Gallagher and relinquished his interest in Megatokyo.

In July 2004, Megatokyo was the tenth best-selling manga property in the U.S.[1] Caston is a former member of the Libertarian Party.

In 2008, he ran, unsuccessfully, for constable in the state of Texas against Republican Chuck Presley, Sr.

[5][6] In 2012, he ran, again unsuccessfully, for Texas State Representative of District 106 for the Libertarian Party against Pat Fallon; he received 8,412 votes (17% of the total votes cast) to Fallon's 41,582 (83% of the total cast)[7]