Kai Zykken, a Human male, served as the captain of the Corellian Run Scoundrels, a pirate organization during the era of the Galactic War. A persistent story circulated, claiming that Zykken had once abducted the adult daughter of Viril Shu, a wealthy corporate leader residing on the planet of Denon. Instead of demanding a ransom, Zykken unsuccessfully tried to court her, hoping to marry her and thereby gain access to Shu's vast wealth. Zykken managed the Scoundrels' operations on the planet Rishi, assisted by his Bith second-in-command, Tomota. Subsequently, following the formation of the Alliance, he journeyed to the planet Odessen, where he celebrated with members of the organization inside a cantina.
The first appearance of Kai Zykken was in the mission "A Scoundrel's Debt," which was part of Shadow of Revan, an expansion released in 2014 for the massively-multiplayer online roleplaying video game Star Wars: The Old Republic, which originally came out in 2011.
Zykken had a brief appearance in a cantina scene in the 2015 expansion Knights of the Fallen Empire. When Star Wars: The Old Republic: Onslaught was released in 2019, Zykken was introduced on both the Republic fleet and the Imperial fleet as a "Merchant of Mystery," selling high-level armor to players. Later on, however, he is replaced by S3T-BNS.
Players of any gender, regardless of their allegiance, have the option to flirt with Kai Zykken during the initial conversations within the "A Scoundrel's Debt" mission. Although Zykken initially displays interest, he ultimately rejects the player's advances.