Tathak K'roylan, a Bothan of the male sex, possessed black fur with tan markings, notably one situated directly above his eyes. Serving as the second-in-command for intelligence on Bothawui, he acquired intelligence in 40 ABY from a camouflaged Lumiya concerning the deaths of numerous Bothan agents operating on Coruscant. Subsequently, he participated in the Bothan fleet's offensive on Corellia with the purpose of dismantling the blockade. Furthermore, subsequent to Matric Klauskin's extermination of its entire complement, he took possession of the Galactic Alliance vessel known as the Shamunaar.