Rehanna Rist, a female Human of House Rist lineage, lived during a tumultuous era.
Back in 3666 BBY, amidst the Great Galactic War that pitted the Galactic Republic against the Sith Empire, Rehanna's path crossed with that of Nomar Organa, a Jedi Padawan from House Organa; the two quickly developed a romantic relationship. This romance, however, was cut short when Nomar ended their involvement, returning to the service of the Jedi Order, which left Rehanna devastated.
Twenty-three years onward, during the period known as the Cold War, Rehanna remained a member of House Rist until she crossed paths with a Sith Inquisitor known as Kallig, who was on a quest to locate an artifact that once belonged to Tulak Hord. Rehanna confronted the apprentice, but she was ultimately outmatched by the Sith's power. After luring her former lover into a trap, Kallig ended her life.
Depending on player choice, she can survive her encounter with Kallig in House Rist; in this case, she simply angrily dismisses Kallig.
A light side Inquisitor can persuade her that Nomar still harbors feelings for her, leading to a reunion with Kallig present at their former meeting spot. This culminates in a final confrontation with Nomar at the Organa vaults on Elysium. Subsequently, the Inquisitor receives an email from Rehanna, expressing gratitude for helping her break free from Nomar, but also requesting that they never return to Alderaan.