Real name: Zira Natasi Tarkin
Affiliations: Dark Lady of the Sith, the First Order
SKills: Force-user, fully trained in the ways of the Sith, TIE Interceptor pilot
Darth Rien is the daughter of Grand Moff Wilhuff Tarkin by his longtime lover, Admiral Natasi Daala. Born 5 yrs. BBY at the Maw Installation, not much is known about Rien's upbringing, and nothing is known of where and when she received the majority of her Sith training, though it is believed that Darth Vader himself bestowed her Sith name and was responsible for her earliest training. What is known is that Darth Rien is considerably more experienced in use of the Force than Kylo Ren, which does nothing to improve relations between these two dangerous Force-users. Rien sees the First Order as the best chance she has to rebuild the Sith, but she also has a secret plan which requires their help - to avenge her father's death on the first Death Star. Rien has vowed that Luke Skywalker will die by her hand and no other, and if she has to use the First Order to fulfil this goal, so be it.
"'My little starlight,' that's what my father called me. Unfortunately, thanks to Luke Skywalker, after Yavin I never heard him call me anything again. I was five years old. This is why I want him dead, General. And in the end, does it really matter to your Supreme Leader whose finger is on the trigger, so long as Skywalker doesn't live to raise a new Jedi Order?" -Darth Rien to General Hux
Credit to all who contributed.