Harry is an enthusiastic and charismatic boy. Although in some occasions he can be selfish, Harry is a good-hearted boy, who is always looking for fun, and thinking about the well being of others. However, he's also bossy, condescending, and has kinda nasty temper. Being the oldest child of the Amber family, Harry acts responsibly and mature. Harry also has a huge crush on Alyssa Armstrong, Sally's babysitter.
In the future, Harry and Alyssa are married and had a son named Charlie. Although the two still love each other as they did 20 years ago, the same can't be said for Alyssa and Harry's relationship with their son. Charlie has a poor relationship with his parents, and because of that, Alyssa and Harry don't want to have children anymore.
Harry, just like Gravito, despises Francis, but his hatred of Francis is stronger than Gravito's.