Albus struggles to live up to his father's legacy and the name of the two great wizards he was named after, Albus Dumbledor, and Severus Snape. While dealing with this he takes out a lot of his anger on his father and pushes him away.
Scorpius starts out as a lonely kid constantly harassed by the other students for his family's history with the dark lord. He changes to where he doesn't mind but so much will be too much and he'll break down
Harry's character development is centered around his past problems as " The Boy Who Lived" and his trust issues with Albus.
He goes from an arrogant snob to a man who is regretting his choice to become a death eater and is focused on protection Scorpius and makes an unsure truce with Harry, Hermione, Ron, and Ginny.