Ka-Tu-Un was a Force-sensitive Cerean male who existed in the latter part of the era of the New Republic. As a Cerean, he underwent training within the Ner Yan tradition (translated from Cerean to Basic as "mind chord"). This group's practice involved training their minds to connect with the Force and establish a mental link between members.
During the Yuuzhan Vong invasion of the galaxy, Ka-Tu-Un was among the many refugees attempting to flee the planet Druckenwell. He sought to escape aboard the MOD-17 container freighter, named Chilastra, but he came to the realization that the invaders had incorrectly identified him as a member of the New Jedi Order.
While he was in the process of trying to get away from the Yuuzhan Vong, Doctor Vlohei betrayed Ka-Tu-Un, resulting in his capture and subsequent interrogation by the Yuuzhan Vong forces.
Within the article for Hive of the Infidel, Ka-Tu-Un is portrayed as a Force-adept belonging to the Ner Yan tradition, without any official connection to the New Jedi Order which was led by Luke Skywalker. However, the preview provided by Wizards of the Coast characterized him as a Jedi Knight.