In which film is Harry Tasker a character?

Who played Roger Murtaugh in 'Lethal Weapon'? Who played Dutch in 'Predator'? In which film is Dutch a character? Who played Harry Tasker in 'True Lies'? Who played Sarah Connor in 'Terminator 2: Judgment Day'? Who played Jake Sully in 'Avatar'? In which film is Jake Sully a character? Who played Neytiri in 'Avatar'?