Klon was a resident of the secret prison camp on Carraya IV. Klon told Toq he was a fool for leaving Carraya with Worf in 2369, and remained behind. Klon was killed, along with almost the entire camp, in an attack by Gorrik, son of Gannik, in 2376. (KE novel: A Burning House)

From the name and story context, Klon is likely a Klingon, though this is not specifically revealed. His or her gender is also not identified.