Who portrayed the protagonist  character in "The Twilight Saga: Eclipse"? 
The Twilight Saga: Eclipse:  Directed by David Slade, the film stars Kristen Stewart, Robert Pattinson, and Taylor Lautner, reprising their roles as Bella Swan, Edward Cullen, and Jacob Black, respectively. Bella Swan:  In the film series, Bella is portrayed by actress Kristen Stewart.
Kristen Stewart