comment: >
  
  1) you're right, legolas has very little agency
  2) Also agree that there is more going on with book legolas
context: “Nerfed to Gimli’s level”?!?!?? 
  Gimili killed 42 orcs… by himself. More than Legolas. >
  
  And without a pussy weapon like a bow. My man got his killstreak up close and personal with his axe. >
  
  I don't think you can consider a character a Mary Sue who has as little agency in the story as Legolas does. In the movies, he really doesn't drive any of the action. He is just a henchman for Aragorn, though with a bit of little bit of character development. There are never really any stakes for Legolas. He's just an NPC. 
  A Mary Sue has to have their own problems and obstacles to easily overcome, and Legolas doesn't. He's just an accompanying character who serves to be a bit of a guide for the main characters.
  (This is Movie only. In the book there is quite a bit more going on with Legolas)