L3-37, also known as L3, Elthree, or Vuffi, is a character from Solo: A Star Wars Story. She is Lando Calrissian's companion, secondary pilot, and confidante. She is headstrong and sarcastic, but still remains a loyal friend.
She was voiced by Phoebe Waller-Bridge, who also portrayed Helena Shaw in Indiana Jones and the Dial of Destiny.
During the heist to steal coaxium from the mines, she frees a droid to get him out of the way. However, she gets carried away and starts freeing the rest of the droids in the mine, which proves fatal as one of the guards shoots her dead. Her CPU is later installed in the mainframe of the Millennium Falcon, thus explaining the rudeness of the Falcon's main computer that C-3PO talks about.
It was hinted that L3 and Lando were in love, as evidenced by Lando's devastated reaction to her death, which in turns helps explain Lando's fondness for the Millennium Falcon.