Siri Tachi is a human Jedi, introduced in Jude Watson's Jedi Apprentice: The Captive Temple (Scholastic, 2000), the seventh book in the Legends young-readers series about Obi-Wan Kenobi's apprenticeship. She rises to Jedi Master, takes Ferus Olin as her padawan, and spends the Jedi Quest books as the mission partner Obi-Wan is most obviously not talking honestly with.
Watson wrote her as an argument the Order does not want to have. Siri and Obi-Wan are in love, both of them know it, and the books treat the Jedi rule on attachment as a real cost paid by real people rather than as set dressing. That is unusually adult material for a series aimed at ten-year-olds, and it is the reason the character kept a following long after the line ended.
Her continuity status is unusual and worth stating carefully. The Jedi Apprentice and Jedi Quest Siri Tachi is Legends. A Siri Tachi then appears in current canon in Mike Chen's novel Brotherhood (Del Rey, 2022) — a separate character with the same name and post, not a reprint of the Legends biography.
So both continuities have her, and they do not agree. Legends gives her a full arc and a death; canon so far gives her a presence. Readers who want the character rather than the name should start with The Captive Temple.
