Alema Rar was a Jedi Knight in Legends books who turned to the dark side of the Force.
Alema debuted in The New Jedi Order book Star by Star. She also appeared in several Dark Nest and Legacy of the Force Legends books.
Check out the entire list of women in 365 Days of Star Wars Women in the Women in Star Wars Index. It includes highlights from each post plus notes which posts include new 365 interviews with actresses, writers, artists, and more.