Herobrine of course was the Main Antagonist. I believe Armen was the Main Character for The Haunting at least. He was the Hero, he sacrificed his life, he was the man we most saw in the movies. It's simply my opinion so chill. However, Drake seems to be the main character of The Haunted.
There is a difference between the main character and the hero. While Armen was clearly the hero, I think that technically Drake is the main character. The main character doesn't have to be the hero.