Who are the main characters in the novel?

The main characters in the novels are Winston Smith, Julia, and O'Brien. Winston is a person who comtemplates about the society he lives in. He tried to resist "the Party" and protect the truth. Winston also gained love that he thought he would never gain. I kind of respected him because Winston was a brave person who even tried to go against "The Party" If I was in this society I would follow along and hold on to the truth, but never express it outside. Julia who also resisted "the Party" has a cool and indifferent personality and was able to blend in the society easily as if she never thought the society wrong. It was pity to see her suffer at a young age though it was her choice. I did not like her much. She seemed live life lightly. O'Brien is part of the Party who disguised himself as one of the rebellion to the society, and caught Winston and Julia who goes against "the Party". I personally dislike him very much for what he do and how he acts. He seems arrogant when Winston and Julia sees him at his house, and acts cold as ice. These characters had their each position that showed us different perspectives.