Drusil Bephorin was a remarkably intelligent cryptologist of the Givin species, and was female.
Bephorin was once an unwilling employee of the Galactic Empire because they had taken her family captive. However, Luke Skywalker and Nakari Kelen liberated her in a Rebel Alliance operation, after which she chose to join them.
As was common for her race, she took great pleasure in tackling difficult mathematical challenges, but she excelled especially in the fields of cryptography and probability analysis. Skywalker often discovered that her sharp observations provided him with a fresh way of thinking about things when he spoke with her. She showed deep love for her family, and while she was with Skywalker and Kelen, she consistently pushed for every possible action to be taken to confirm the success of the mission to save her family.