Kai Zykken was a male Human who was captain of the Corellian Run Scoundrels, a pirate gang during the Galactic War. A persistent rumor was that Zykken once kidnapped the adult daughter of Viril Shu, a corporate magnate on the planet Denon. Rather than ransom her, Zyyken unsuccessfuly attempted to woo her into marrying him, thus allowing Zykken access to Shu's fortune. Zykken ran the Scoundrels on the planet Rishi with his Bith lieutenant Tomota. Later, he would go on to visit the planet of Odessen following the establishment of the Alliance, whereupon he would celebrate in a cantina along with the members of the organization.
Kai Zykken first appeared as part of the mission "A Scoundrel's Debt" from Shadow of Revan, a 2014 expansion to the 2011 massively-multiplayer online roleplaying video game Star Wars: The Old Republic.
Zykken made a cameo in the 2015 expansion Knights of the Fallen Empire during a cantina cutscene. With the release of Star Wars: The Old Republic: Onslaught in 2019, Zykken was added to the Republic fleet and the Imperial fleet as a "Merchant of Mystery," selling endgame armor to players. However, he is later replaced by .
Players of any gender aligned with either faction may choose to flirt with Kai Zykken during the opening conversations of the "A Scoundrel's Debt" mission. Zykken initially seems interested, but ultimately turns down the player.