Who played Bella Swan in 'Twilight'?

Who played Legolas in 'The Lord of the Rings: The Fellowship of the Ring'? In which film is Legolas a character? Who played Gollum in 'The Lord of the Rings: The Two Towers'? Who played Katniss Everdeen in 'The Hunger Games'? In which film is Bella Swan a character? Who played Edward Cullen in 'Twilight'? Who played Elphaba in 'Wicked'? In which film is Elphaba a character?