Alexia "Lexi" Branson was a character who first appeared in the eighth episode of the first season in The Vampire Diaries. She was a vampire and was also Stefan Salvatore's best friend and companion. She had known Stefan and his brother Damon for over a century. Damon killed her to make the Town Council think that she was the vampire terrorizing Mystic Falls. She was 350 years old, placing her birth date around 1659 and her turning year in 1680.
Lexi met Alexandria Gilbert briefly before she died and gave her some relationship advice, encouraging her to give Stefan a chance. Alex thought of Lexi as a friend after they talked, realizing how much she cared about Stefan.
In Season Five, she returns in Home, and saves Stefan from going into Hell, but she manages to find peace and disappears. She continues to watch over him and greets him when he too dies in I Was Feeling Epic.