Tian Chyler Tian Chyler was a Human female who served the Alliance to Restore the Republic . Initially a member of the Galactic Empire ' s Sub - Adult Group , Chyler was selected by her superiors for training from the Imperial Security Bureau . After completing her training , she was tasked with rooting out Rebel Alliance sympathizers within Imperial Center ' s law enforcement community . She did so skillfully , and was given a more important role : the infiltration of Bespin ' s mining guilds , to investigate the possibility of any unregistered Tibanna gas mining . Posing as a Corellian official fleeing from Ando , Chyler soon discovered that Bespin ' s Cloud City harbored a considerable amount of under - the - table mining . Reporting her findings to the Sith Lord Darth Vader , she was promised a promotion by her superiors in the Bureau . Unfortunately for Chyler , an uprising amongst Aqualish miners led her to be reprimanded for not being able to keep the employees in check . She never received her promotion , and , growing frustrated with the Empire , she defected to the Alliance . Biography . From the Sub - Adult Group to the Bureau . Cousin of the famous swoop racer Kimmi Chyler , the Human female Tian Chyler was a member of the Imperial Sub - Adult Group , part of the Commission for the Preservation of the New Order , where she displayed a streak of ruthlessness and pragmatism that attracted the attention of the Sub - Adult Group leaders . They , in turn , sent her to the Imperial Security Bureau for training . Although most who made the transition from the Sub - Adult Group to the Imperial Security Bureau were dismissed as zealots , Chyler ' s results silenced her detractors . Once she had completed her training , she successfully infiltrated Imperial Center ' s law enforcement community , tracking down and ferreting out Rebel spies . Her superiors were pleased , and they noticed that she had a particular skill for blending in with her surroundings . Chyler was subsequently tasked with a more significant mission : investigating unregistered Tibanna gas mining operations on Bespin . During her mission , she would be working with several other Bureau agents . She was instructed to masquerade as a Corellian mining official from Ando who had been able to escape the Imperial occupation of the world . Chyler was to claim that she was seeking sanctuary at Cloud City alongside Andoan officials and Aqualish workers . Cloud City was more than happy to receive them , and put them to work in the Cloud City Miner ' s Guild , though Alliance sympathizer Willrow Hood was suspicious of Chyler ' s background and motives . Cloud City . In short order , Chyler and her colleagues were able to discover the full extent of Cloud City ' s unregistered mining operations . In 3 ABY , Chyler herself passed the information onto Lord Darth Vader , who in turn used the information to blackmail Baron Administrator Lando Calrissian into helping him capture the Rebel commander , Luke Skywalker . Calrissian complied , but Vader was unable to successfully capture the Rebel . Shortly afterward , his troops took over Cloud City , and Calrissian was forced to flee . The Bureau was satisfied with Chyler ' s work , and prepared to offer her a promotion , but unfortunately for the prolific agent , the Aqualish miners chose to revolt , causing a great deal of fuss at the gas platforms . The upstart Aqualish were subsequently executed by the Empire , but Chyler was denied her promotion and received a reprimand for failing to keep the miners in check . She was left at her post on Cloud City as an undercover agent to root out Alliance sympathizers , but was never again considered by the Bureau for promotion . Chyler grew frustrated , and as the Alliance started to gain the upper hand in the Galactic Civil War , she decided to defect , contacting A ' roFilter employee Willrow Hood , who she suspected of having Rebel connections . Hood was initially wary of Chyler , as he had believed for some time that she had Imperial ties , but he eventually came to trust her , and she provided information about Cloud City ' s defenses to the Alliance that proved vital during the Battle of Bespin in 4 ABY . Personality and traits . Tian Chyler was looked upon as an exception to the informal rule that Sub - Adult Group members who transitioned into the Imperial Security Bureau were fanatical zealots . The streak of ruthlessness that ran through her attracted the attention of her superiors , fast - tracking her career . Chyler was particularly adept at infiltration and working undercover , and her ability to blend in with her surroundings was a constant asset . When her advancement hit a dead end after her aiding Lord Vader in 3 ABY , her frustration reached such a level that she was willing to throw away the doctrines and teachings that had been drilled into her since she was a child , and join a force in opposition to Emperor Palpatine . Behind the scenes . The character of Tian Chyler first appeared in the 1997 Special Edition re - release of Irvin Kershner ' s , but was unnamed for her appearance . The " Special Edition Limited " set of the " Star Wars " Customizable Card Game identified the character as " Chyler , " an agent for the Imperial Security Bureau from " " . " Chyler " is an anagram of Cheryl ( Kallenbach ) , the wife of a Decipher employee . In 2007 , Timothy Carlsson , writing as " yoda ' s waiter , " elaborated on the character ' s story through StarWars . com ' s feature , " What ' s The Story ? " Carlsson ' s entry , which was published in the Databank , made a number of Expanded Universe connections , to such elements as the Battle of Bespin , alluded to in " The Truce at Bakura " , Ando from " " , and the Sub - Adult Group from the " Imperial Sourcebook " . Carlsson initially named the character " Sana Robben , " with Chyler being an alias , but this was changed by the StarWars . com staff . Also exorcised from the entry was Chyler ' s homeworld , which Carlsson had identified as Coruscant . An element that Carlsson opted to cut out was an alluded to rivalry between the Sub - Adult Group and the Imperial Security Bureau ; he ultimately felt that the plot thread did not make much sense . He consciously chose not to elaborate on Chyler ' s character , as he felt that " kind of like James Bond , " the character ' s actions were more important than their origins . His idea to have Chyler ferret out Alliance sympathizers amongst the Imperial Center law enforcement community was loosely inspired by " " . Instead of unregistered Tibanna gas operations , Carlsson had originally focused on Cloud City ' s failure to pay tribute to the Empire in order to remain neutral . This was inspired by tributary shipping of iron and ore to during . The character ' s first name of " Tian " was provided by Ian Tapley , author of Olana Chion and Antidar Williams Databank entries . The name itself was a tuckerization of Tapley ' s first name , and the initial of his surname . In his " What ' s The Story ? " submission for Willrow Hood , Benjamin Christopher Norton Dawe chose to explain how Chyler defected by involving her in Hood ' s backstory . The " Star Wars Galaxies Trading Card Game " expansion set , " The Shadow Syndicate " , introduced the character Kimmi Chyler , a famous swoop racer active during the Galactic Civil War . The subsequent expansion , " The Price of Victory " , included a Tian Chyler card which revealed that the two characters are cousins .