Tamar Kir-Bataar is the twin sister of Tolya Yul-Bataar and a Heartrender. She is a supporting character in Siege and Storm and Ruin and Rising. She is a former member of Sturmhond's Crew. Tamar is a member of the Soldat Sol, an order dedicated to protecting The Apparat and Sun Summoner.
Though she is a powerful Heartrender, she usually fights with weapons, especially axes. She has a lot of concealed weapons.
Tamar is described as "a girl with short dark hair" with gold eyes, like her brother. Because of her Shu heritage, her eyes are slightly tilted.
Tamar is in love with Nadia. Since their stay in the spinning wheel they're a couple.
Tolya and Tamar are twins and have much in common. They are a good team and almost inseparable.
Tamar knows Nikolai under the alias Sturmhond since she was a member of his ship's crew and still has a very good relation to him. In the end of the story she becomes Nikolai's bodyguard, together with her brother.
Tamar is a true and loyal friend to Alina. She is Alinas bodyguard, trains the Soldat Sol so they can protect Alina and helps Alina and the other grisha to escape from the White Cathedral. She guards Alina during her stay at the spinning wheel and escapes with her on board of the Bittern, helping Alina finding the Firebird and planning the last battle.
- In Siege and Storm, Tamar's surname is spelled Kir-Baatar; however in Ruin and Rising and the cast of characters in Crooked Kingdom, it is spelled Kir-Bataar.
- Her name is pronounced tay-mahr keer-buh-tahr.