Atris 2

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Atris's dark-robed model.There is some indication that Atris was originally planned to be the player's party member at some point, most probably after Kreia's departure for Malachor V. For example, the name of her appearance set is "Party_NPC_Atris". An unused party member portrait for Atris is also present in the game files. Furthermore, she is the most prominent figure in promotional material for the game, comparable to Bastila Shan in the first game. Bastila was a party member and played a major role in the plot, whereas Atris's role is relatively small.[4]
Should the Jedi Exile be a male, Brianna would not simply join the Exile out of belief that Atris may have been wrong but rather that Atris had personally sent her to watch the Exile and study him and to make sure that he does not contact the Sith.[4]
Originally, the Disciple Mical would not only be a spy for Admiral Carth Onasi or Admiral Cede but also for Atris. En route to Telos shortly after the Exile's confrontation with the Jedi Masters in the Jedi Enclave, the Disciple would contact Atris and inform her of the Sith's pending attack.[4]
Cut content from her dialog with Kreia indicates that Atris's fall involved Kreia making references to Telos, and how twice the choices of the Jedi had marked the planet for destruction, first by Revan as Telos was to host the Jedi and their lore in the avenue of a sudden attack, then by Darth Nihilus because Atris chose to hide there. Interestingly the destruction of Telos was ordered by Darth Malak according to the first game, but whether this was the reason for this content to be discarded is unknown.[4]
During the Exile's battle with Atris, at some point, Atris would use her (the Exile's) own lightsaber against the Exile, claiming it's not hers to wield anymore.

Concept artwork of Atris battling Darth Nihilus.Originally, the light side and dark side endings differed from each other more significantly than in the final game. One possible ending featured Kreia's redemption and Atris's total shift to the dark side, which culminated in the scene where Atris attacked the player wearing a black robe and claimed that she, not Kreia, was Darth Traya. Her dark side model remained in the PC version of the game and can appear in the main menu if the CurSithLord option is set to 1 in swkotor2.ini. An Action Replay mod is needed to view it on the Xbox.[4]
Later on, the dark side model of Atris (see above) was planned to be put in the final game for the confrontation with Atris, but it was removed a few weeks before the game was released, with the reason that the presence of the dark side model was confusing the game testers.