lord of the rings
I really liked Arwen pretty much from her first appearance, in the Fellowship, and liked the fact that Peter Jackson took the route of having Arwen being a faster rider than Aragorn and have her be the one that got Frodo to safety.
Liv Tyler endows her with a great sense of dignity, as you would expect from a character who is supposed to be thousands of years old. I was immediately interested in watching her story unfold.
Her belief in Aragorn in particular, and the humans in general, despite her father’s frequent and vehement objections, is one of the things I really liked about her.