Yukiri is an Aes Sedai of the Gray Ajah and is a Sitter for the Hall of the Tower. She remained loyal to the White Tower during the split. She has not bonded another Warder since hers died several years ago.
Yukiri is tiny but has a queenly bearing, with green eyes. She is incredibly stubborn. 
She was an innkeeper's daughter.
Yukiri, Doesine Alwain, Saerin Asnobar, and Talene Minly follow Pevara Tazanovni and Seaine Herimon into rooms below the White Tower, where they discover them with the Oath Rod. Yukiri reswears her Three Oaths, proving she is not Black Ajah, but Talene refuses to reswear them and is discovered to be Black Ajah after being questioned on the Chair of Remorse. They question several other Aes Sedai and inadvertently find out about the Salidar spies in the Tower. As a result of this, Yukiri orders Meidani, one of the spies, to renew her friendship with Elaida do Avriny a'Roihan.
Yukiri is present when Elaida grants the Sitters' requests to begin negotiations with the rebel Aes Sedai.
She meets with Pevara to discuss progress on hunting the Black Ajah. She is in the White Tower basement when Meidani brings in Egwene al'Vere. Egwene tells them to continue finding the Black Ajah but remove the fourth oath they have placed on the rebel spies. Egwene also points out that Siuan Sanche was deposed unlawfully due to at least one known Black Ajah member being part of the bare minimum of Sitters required.
She is in attendance when the Hall meet with Rand al'Thor. At the meeting Rand announces that he is going to break the remaining seals on the Dark One's prison. She tries to speak but Rand's ta'veren nature keeps her quiet.
Egwene punished Edit
Yukiri is at dinner with Elaida and most of the other Sitters when Elaida begins to taunt Egwene and demands her to stop telling lies about a Seanchan invasion on the White Tower. Egwene refuses and enrages Elaida to the point where she uses the One Power on Egwene, drawing blood and sending her unconscious. She pledges her support behind Egwene and stands with the rest of the Hall to raise Egwene unanimously as the new Amyrlin Seat.
She meets with Egwene, Saerin, and Seaine and discusses who Mesaana could be posing as in the White Tower and how she could have defeated the Three Oaths. Egwene tasks them with finding the Forsaken. Yukiri is one of seven Sitters who take part in Nynaeve al'Meara's test for the shawl inside the oval ter'angreal. The testing is unusually severe. She is one of the four Sitters - the others being Saerin, Seaine, and Romanda Cassin - who think her worthy, thereby allowing her to be raised properly.
She arrives late to a secret meeting called by Hall of the Tower. Yukiri votes for a proposal that would allow only Egwene to deal with the monarchy of the world, which includes Rand as he is King of Illian, while the Hall would take over prosecution of the war and deal with Gareth Bryne's army. In that same meeting, Yukiri votes in favor of the new rules and procedures in the Hall, which include temporarily replacing a Sitter when she is absent from the Hall and that no meeting of the Hall can commence without all Sitters and the Amyrlin Seat being present.
Attack of the Black Edit
Egwene sets up a meeting in Tel'aran'rhiod, which Yukiri attends, between Aes Sedai, Sea Folk Windfinders, and Aiel Wise Ones. It is decided at the meeting that Accepted will go and train with the Wise Ones for six months and then they would train with the Sea Folk for a further six months before returning back to the White Tower. They would then make a choice a year later on where they would wish to finish their training. Sea Folk and Wise One apprentices would also go through this training program but to the White Tower and the other channeling faction. It is agreed that for every two Accepted who leave, two Wise One apprentices and two Sea Folk apprentices will be exchanged. The Sea Folk Bargain is also modified so that Aes Sedai sisters no longer have to teach Sea Folk Windfinders anymore and that Sea Folk Aes Sedai can now return back to their homeland and be the channelers who teach the Sea Folk Windfinders. Finally, all ter'angreal that are already owned by the Aiel or by the Sea Folk cannot be claimed by the White Tower.
The Black Ajah attack after the meeting in Tel'aran'riod. Yukiri is one of the Aes Sedai who participate in the Battle in Tel'aran'rhiod.