This hero is the previous Receiver of Memory. So now he is a tutor and mentor of the new Receiver. After reading the next information, you will understand why he is the visualization of the best person, moreover, the best human of this and all other worlds.
Like Jonas, who is a young person with the wisdom of an old person, the Giver is a bit of a paradox. He looks ancient, but he is not old at all. Like someone who has seen and done many things over many years, he is very wise and world-weary, and he is haunted by memories of suffering and pain, but in reality, his life has been surprisingly uneventful. In the world of the community, the Giver has spent most of his life inside his comfortable living quarters, eating his meals and occasionally emerging to take long walks. Yet he carries the memories of an entire community, so he feels like a man who has done more in his life than anyone else in the world: he has experienced the positive and negative emotions, desires, triumphs, and failures of millions of men and women, as well as animals.
He is responsible for preserving those memories and using the wisdom they give him to make decisions for the community. Anyone would feel weighted down by this enormous responsibility, and because the Giver is forbidden to share his knowledge and pain with anyone else, including his spouse and his children, the weight is more difficult to bear. He is passionate but calm; he always knows what to say and when exactly to do something. Maybe he is the wisest person from the entire Universe of books.
The Giver in the Essays