Who played Harry Tasker in 'True Lies'?

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