Jane Foster

Jane Foster is the deuteragonist in Thor and its upcoming sequel Thor: The Dark World. Although she didn't appear in The Avengers herself, she is mentioned when Coulson tells Thor that she is taken to safety. She is a brilliant astronomer and cosmologist, and also Thor's partner and love interest. She is portrayed by Natalie Portman.

Character traits
Jane Foster is a strong a determined woman, with an obstinate will and an independent spirit. She firmly believes that scientists have been invested with the mission of searching the truth and loyally follows this idealism. She possesses a deep knowledge for her study field, astrophysics, and of her peers, she single-handedly came the closest to discovering the existence of Asgard by studying the wormhole-like traces left by the use of the Bifrost Bridge.

Trivia

 * In the comics, Jane Foster starts as a nurse, not an astrophysicist, but the Studios wanted to update the character. She is enamored with Donald Blake having broken up with Thor decades ago in the comics.