Shaa was a Lady Sith introduced in a flashback sequence in the comic Darth Vader: Dark Lord of the Sith 22.
There isn’t a lot to say yet about Shaa (hopefully the first female Sith Lord introduced in Star Wars canon will get more of a story) but I can tell you she was created by writer Charles Soule and illustrated by Giuseppe Camuncoli.
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.
