Thon was an Andorian who served in the Andorian Imperial Guard.
In 2151, Thon was serving aboard the Kumari when Thy'lek Shran led a raid on the P'Jem monastery. During the raid Thon was stunned in a fight. (ENT episode: "The Andorian Incident")
In 2155, Thon served aboard the Ka'Thelan Krotus when it fought at the Battle of Threllvia IV. Shran believed Thon to have died in the battle. (ENT novel: Beneath the Raptor's Wing)