Additional Info.As a vampire, he gained the ability to sense and manipulate the emotions of those around him. Recognizing his high rank in the army, Maria decided to change him into a vampire to help her claim territory in Monterrey. Jasper's responsibility was to train young vampires and then kill them when they were no longer useful (about a year after their transformation- when their strength began to fade).
After about a century of this, he grew weary of the lifestyle and joined an old friend, Peter, and his mate Charlotte. Jasper left the two eventually, not wanting to feed on humans because he could feel his prey's emotions as they died. Alice, foreseeing that they would be together, met him in a half-empty diner in Philadelphia, and together they sought out the Cullen family. During their companionship and travels, they soon fell in love and were later married.
Due to his past, where he was able to feed on humans whenever he chose, Jasper lacks strong self-control. He is described as tall with honey blond hair, and is muscular but lean and is physically 20 years old. His body is covered with crescent-shaped scars, after the many years of fighting and training newborn vampires.