It all depends on which perspective you want to look at. George Orwell was writing about a view of the governments of the future. If you read the book with that in mind you will find the government (IE Big Brother) on every page of the book as one of the main characters. Winston even makes the observation after they had caught him that they had been watching him all the time:- They had photos of him with Julia even when they thought they were alone in the forest outside of the city; they had his diary notes even though he had hidden it outside of the view of the telescreen; they had many pieces of information, notes, tape recordings, etc from his life that it appears they had been bugging him 24 hours a day for years. So if the book is about the government system and it is one of the main characters in the book, the government can be seen as the protagonist and Winston as the antagonist. On the flip side, since the book is chiefly written through Winston's eyes, it could be argued that he is the protagonist and the government the antagonist.
Bruno is the protagonist.
Torture
nobody knows
Former member of the Inner Party .
Emmanuel Goldstein .
Savvy Christopher
Kino
Nancy is the protagonist and Collin is the antagonist.
The protaganist for the novel stargirl is of course, Stargirl
The protaganist in the amazing spider-man is peter parker
The main character in Something Upstairsby Avi is Kenny Huldorf.
Well being from the point of view of Katiniss, the major protaganist is Katniss herself. You could have the protaganist maybe confused as being Peeta but its definitely Katniss.
Dinnie
Antigone
The fight. an antaganist is an obstacle that comes in the way of the protaganist in this case the protaganist would be Felix and Antonio.
batman.
Bella still is the protaganist in Breaking Dawn but Jacob is the second main charachter. I hope this answered your question.