Leia always reminds me a lot of her dad- headstrong, a force to be reckoned with, a bit short tempered, a natural leader & military strategist. She's gotta have a dark side similar to his, too, right?

Han's death, and the fact that their son killed him, shakes Leia up, and that dark side comes out. They capture a First Order agent with info on the whereabouts of Kylo and/or Snoke, but they're not talking. Frustrated, Leia asks for a moment alone with the prisoner, and when no one's watching, force-chokes them for information. (Inspired by an episode of Clone Wars where Anakin does exactly that to Poggle the Lesser).