Irina

Irina was a vampire, one of the original Denali "sisters" and an originator of the myth of the succubus. She was a "vegetarian" and led a very peaceful lifestyle. She and Laurent had a relationship before he was killed by the shape-shifters in New Moon. Irina was killed by Caius after giving false information to the Volturi about Renesmee Cullen.

Early life
Irina, Tanya, and Kate were orphaned by the Volturi because their mother, Sasha, the vampire who had transformed each of them, was harboring an immortal child named Vasilii; a human child that was turned and therefore couldn't learn to control themselves due to their primitive minds.

The sisters were responsible for the myth of the succubus, as they would have sexual relationships with their human men. The Denali sisters lived a vegetarian lifestyle, and were close friends of Carlisle Cullen. After Laurent came to live with the Denali Coven, Irina started a relationship with him; which was ended following his death at the hands of the Quileute werewolves.

Betraying the Cullens
Irina did not appear at Bella and Edward's wedding with the rest of the Denali coven, because she was still upset at the wolves for killing her Laurent. Later as Bella, Jacob, and Renesmee were hunting, Irina watched them from a distance. She thought that Renesmee was an immortal child that Bella had created, knowing that the "immortal child" was an illegal creation, Irina ran to tell the Volturi, but not before Bella saw her. Bella called Edward to tell him what happened. He and Carlisle arrived soon and tried to run after Irina, but she had already disappeared.

Afterwards, Alice foresees the Volturi's decision to visit Forks, and explaining that she was not trying to predict their actions, but trying to find Irina, Bella came to the conclusion that Irina assumed that Renesmee was an immortal child and that she must had decided to go to the Volturi and tell them about Renesmee. Irina was with the Volturi when they arrived in Forks to punish the Cullens. She is called upon by Caius to bear witness to Renesmee. Irina then came to the conclusion that she was wrong and that there was no reason for the Volturi to be there. She declared that she didn't want the Cullens to get hurt and that she would take full responsibility for her actions. In Breaking Dawn, she explains to the Volturi that she was upset because she was under the impression that the Cullens killed Laurent, but really it was the shape-shifters responsible. Meanwhile Caius signaled the guard and Irina was destroyed in front of all the vampires present. Caius merely looked on and proceeded to set Irina ablaze, as a plot to enrage Kate and Tanya into attacking the Volturi guard. Caius later justified this by saying that "now she has taken full responsibility of her actions".

Physical description
Irina was described as being a vampire with chin length silvery blonde hair and golden eyes.

Laurent
Laurent came to Denali after he left James and Victoria. There, he and Irina met, and fell in love. Though Laurent was having trouble sticking to the vegetarian diet, occasionally he came down to the Forks area, hunting humans. He also came down to Forks as a favour to Victoria, to check and see if Bella was still under the protection of the Cullens. It was there, that he was killed by the Quileute werewolves when he attempted to kill Bella Swan. Irina was enraged and it was because of this that prevented the Denali Coven from helping the Cullen family during the newborn crisis of Seattle and what led Irina to turning the Cullens in for supposedly creating an immortal child.

Tanya
Tanya was Irina's eldest adoptive sister, as well as leader of the Denali Coven after their mother was killed centuries ago. She loved her and Kate above everything else, which drove her to confess her mistakes in order to protect them.

Kate
Kate was Irina's other adoptive sister, and the only one with a gift. She loved her and Tanya above everything else, which drove her to confess her mistakes in order to protect them.

Appearances

 * Breaking Dawn (First Appearance)
 * Breaking Dawn - Part I
 * Breaking Dawn - Part II

Film portrayal
On September 27, 2010 it was announced that Irina will be portrayed by Maggie Grace in The Twilight Saga: Breaking Dawn Part II.