Kate Denali

Kate was an attendant - basically a bodyguard - to a highborn female of a warlike Slavic tribe. She was well trained in her tribe's martial arts, and was very protective of her mistress. Kate was guarding her on a caravan when Sasha attacked, along with her daughter Tanya. Sasha was so impressed by Kate's courage and determination to defend the caravan and the physical resemblance she had to Tanya that she changed her into a vampire.
ate quickly became loyal to Sasha and Tanya. Her defensive power began to develop within a decade. Later, Sasha invited Irina into the family, and they all saw Sasha as their mother. They were left orphans when it was discovered that Sasha had created an immortal child named Vasilii. Fortunately, Kate and her sisters knew nothing about the boy until they watched him burn in their loving mother's arms. Aro thus spared their lives, and since then they have been purists for the law. Kate's respect for the Volturi's authority kept her from questioning their motives, and she was grateful when they spared her and her sisters, though they were scarred for eternity by the loss of their mother.
Kate and her sisters sought out the company of different men, human or vampire, to distract their minds from the pain of their lost mother. The human relationships never lasted long, since they always fed on the men shortly after, but the losses of some of the men they grew fond of made the girls remorseful of their actions. When Tanya told her sisters that drinking animal blood could replace their nutritional needs without decreasing their control around humans, Kate was eager to try the method. They moved to Denali to adapt to their vegetarian diet and by the time Eleazar and Carmen joined them, they had all grown adept at the diet, and at enjoying human intimacy without causing injuries. When they met the Cullen family, another coven of vegetarian vampires, they bonded through this matter and considered each other extended family.

In 2005, they were joined by a vampire named Laurent after he left his previous coven, and formed a brief romantic bond with Kate's sister, Irina, before getting killed by the Quileute werewolves.

Kate, along with the rest of the Denali Coven (except Irina, who still harbors a grudge against the Quileute shape-shifters for killing her mate Laurent) attend Bella and Edward's wedding as a way of making peace with the Cullens for abandoning them during their time of crisis. Kate introduces herself to Bella after the ceremony. When Tanya jokingly says it may be her and Kate's turn next, Kate simply replies "keep the dream alive".

Along with Tanya, Carmen and Eleazar, she was called upon as a witness by the Cullens, and she grows attached to Renesmee after finding out that she wasn't an immortal child. Kate, aided by Zafrina, helps teach Bella to extend her shielding range in the hope of including as many people as possible during the final confrontation with the Volturi. She agrees to help Bella on condition that she wouldn't break her radius, due to Bella's phenomenal strength. During their practice sessions, Kate shocks Edward with powerful mental electrical jolts that she can generate all over her skin over and over again as a way to motivate Bella. This does not motivate her enough though, so Kate uses Renesmee instead, and Bella succeeds in extending her shield, although she almost loses her temper and attacks Kate for attempting to harm her daughter.

During the build up to the fight, Kate develops an attachment to a nomad named Garrett. She is present during the confrontation, ready and willing to fight if it came down to it. She is forced to watch her sister Irina be burned to death by the Volturi as punishment for her false report about the Cullens, and attempts to attack them with Tanya. However, the combined effort of Carlisle, Edward, Garrett, Bella and Zafrina manage to stop them. Kate is known to dislike Jane of the Volturi, and claims Jane as her opponent, saying she would like to give her a taste of her own medicine. Garrett promises her that he will follow her anywhere if they survive the confrontation.

In Alice's vision of the battle, Kate is fighting the Volturi's minions and their allies, using her power to her advantage. She shocks Caius to immobilize him, giving Tanya the chance to kill him. However, when Aro sees his own destruction in the vision, he talks his coven into leaving in peace, with another vampire-human hybrid's testimony to help.

After the Volturi left in peace, Kate and her family return home to grieve for their lost sister, though she has also gained Garrett as her mate.