Jocasta Nu was a Jedi Master who worked as the Chief Librarian of the Jedi Archives. She appeared in Attack of the Clones and was portrayed by actress Alethea McGrath (Day 57). She later appeared in the comic series Darth Vader.
Jocasta Nu is a good example of a character who had a different story in Legends and canon. In Legends Jocasta Nu died in the Revenge of the Sith video game adaptation during Order 66. In canon Jocasta Nu survived Order 66. Read more about this on her Wookieepedia page.
Jocasta Nu also appeared in several episodes of The Clone Wars TV series where she was portrayed by actress Flo Di Re. In Legends materials she also makes appearances in the novel Darth Plagueis and several books from the Jedi Apprentice and Jedi Quest series.
Here’s a deleted scene from Attack of the Clones that includes Jocasta Nu.
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.