The Giver is firm and focused.
He has a job to do, and does it, even though it is painful. In the first paragraph of Chapter 14's second section, it says, "The Giver led Jonah firmly...into the deep and terrible suffering of the past." In the middle of Chapter 18, in talking about Rosemary, he says, "...it broke my heart...to transfer pain to her. But it was my job."
He is also kind and compassionate.
With Rosemary and Jonah he always tries to soften the harsh memories with happy ones. In Chapter 14, Jonah says, "Each time, in his kindness, The Giver ended the afternoon with a...memory of pleasure."
The Giver is terribly lonely.
As he explains in Chapter 20, the "worst part of holding the memories is...the loneliness of it."
The Giver is courageous and unselfish.
He wants to escape with Jonah in Chapter 20, but will stay because he knows if he goes, "...the community will be left with no one to help them..." through the troubles ahead.