Siri Tachi (Siri Miller after her marriage to Kazuhira Miller) was a female Human Jedi Master, apprentice of Adi Gallia and Master to Ferus Olin. She was a talented pilot who participated in the First Battle of Geonosis, fighting alongside Master Gallia guarding the Galactic Republic transports in space above the planet.
She was one of Obi-Wan Kenobi's closest friends, and at one point they were romantically involved. During the Clone Wars, she met an early death on Azure while on a mission with Kenobi.
Siri Tachi was usually very determined and focused. As an apprentice, her strong determination often made it difficult for her to avoid combat when given the choice. Her focus and self-belief also made it difficult for her to work well with others, often as she considered herself strong enough to complete things on her own. But with Obi-Wan's example, Tachi became more patient and prudent. She was loyal to the Jedi Order and until after the mission to Kegan, she held Obi-Wan Kenobi's decision to temporarily leave the Order against him. This loyalty later allowed Kenobi to come to the conclusion that Tachi had not left the Jedi Order.