Isabella Marie "Bella" Swan, was born to Charlie Swan and Renée Dwyer on September 13, 1987, is the protagonist of the Twilight series. In Twilight, she is a 17 years old girl who transfers schools from Phoenix, Arizona to Forks, Washington to live with her father, where she falls in love with a vampire, Edward Cullen. In Breaking Dawn, she marries Edward and becomes a full member of the Olympic Coven. She is transformed into a vampire by Edward after nearly dying giving birth to their daughter, Renesmee Cullen, a vampire/human hybrid. Bella is the daughter-in-law of Edward's father and Elizabeth Masen, as well as the adoptive daughter-in-law of Carlisle and Esme Cullen. She is the adoptive sister-in-law of Alice Cullen, Emmett Cullen, Rosalie Hale and Jasper Hale.
As a human, Bella possessed a natural immunity to the mental powers of vampires. After her transformation she develops it into the ability to project a mental shield she can use to protect others from the mental powers of other vampires. Kate and Zafrina were pivotal in her mastery of this skill.