What happened to Eli and Oskar? Someone says that in the book they mix blood, and Oskar becomes a vampire. Can anyone confirm this? & also was Eli a boy or a girl?
Oskar does not become a vampire in the book. It is Håkan who becomes a vampire in the book. Also in the book, it is disclosed that Eli is a boy who was castrated years ago when he was converted to a vampire.
In the movie, neither Håkan becomes a vampire nor is Eli disclosed to be a boy. Oskar and Eli flee. And as atm mentions in the comment, Oskar will grow old just like Håkan.