JK begins her series with an intensified attention to Harry's adoptive family and how he, as a small boy, has to endure the evils and the sadness of loneliness, misunderstanding, and a lack of belonging. He loved his parents, he misses them incredibly, and he absolutely needs a home. Once Harry understands his role in life, he engages directly in a pursuit of different things that, ultimately, lead to understand HIS life and his origins better.
The topic of his parents continues to occur throughout the books as a symptom of confusion vs. the need for belonging, after all, how do you live with yourself when all your life you have been a deject of a family and, all of a sudden, you are a sought-after Wizard with a pedigree and about 1,000 missions to fulfill in an alternative universe? Yet, as astonishing as that sounds, Harry would probably have given anything to be with his mom and dad. Even as a well-grown Wizard, even after achieving every ultimate goal, the topic of Harry's hunger for the love of a family and for the warmth of his mother, his father, and a normal life is the topic that is most easily read between the lines of all his adventures.
Rowling portrays Harry, for the most part, as a typical teenager who has the same desires and emotions. Especially in book 5, we get a glimpse of his teenage angst phase. But in all the novels, Harry is characterized as incredibly brave, kind, a good leader, and a tad reckless.