 The scent of her O negative blood is incredibly attractive to vampires, described by Bree Tanner to be the "sweetest scent she'd ever smelled", though it is a thousand times more intense to Edward Cullen.As for distinguishing features, Bella has a small crescent-shaped scar on her hand where she was bitten by James, a tracker vampire, in "Twilight".The scar is described as being pale, always a few degrees colder than the rest of her body, and it shines like a vampire's skin when exposed to the sunlight.