Main article: Bella SwanIsabella Marie "Bella" Swan (later Bella Cullen) is the fictional protagonist of the Twilight series, written by Stephenie Meyer. The Twilight series, consisting of the novels Twilight, New Moon, Eclipse, and Breaking Dawn, is primarily narrated from Bella's point-of-view.
In Twilight, Bella moves to her father's home in Forks, Washington, meets the mysterious Cullen family, and falls in love with Edward Cullen. However, she soon discovers that the family is a coven of vampires. Bella expresses a desire to become a vampire herself, against Edward's wishes. In the second novel, New Moon, Edward and the other Cullens leave Forks in an effort to keep Bella safe from the vampire world. Jacob Black, a member of the Quileute tribe who is also a shape shifter taking a wolf form, comforts the distraught and severely depressed Bella. She comes to care deeply for Jacob, though less than she loves Edward. In Eclipse, Bella becomes engaged to Edward, and they marry in Breaking Dawn. Edward then transforms Bella into a vampire after she nearly dies giving birth to their daughter, Renesmee. Bella has the ability to shield her mind (from mind reading, attacks, etc.), an ability she's had from the beginning. But once she is transformed into a vampire, her ability is enhanced to where she can also expand her shield to protect others from mind control.