His character would develop a more global perspective. Instead of just focusing on the wizarding world's problems, he'd be aware of the wider universe of threats that the Justice League faces. This could make him more open - minded and innovative in his approach to solving problems. He might also be more physically fit and combat - ready, having trained with Batman and others. His relationships with others would be different too. He might not have the same close - knit group of friends as in Hogwarts, but rather a more diverse group of allies from different backgrounds, like the various members of the Justice League.
If raised by the Justice League, Harry would grow up with a sense of wonder about different kinds of powers. He'd be exposed to superpowers like super strength, speed, and the ability to fly from a young age. This would influence his view of his own magic. He could become more experimental with his magic, trying to combine it with the superhero powers in some way. His development would also be affected by the Justice League's code of ethics. He'd be more likely to question the sometimes archaic rules of the wizarding world. For example, he might think about how the wizarding world could be more open and inclusive, like the superhero community. He'd be a more complex character, with a blend of wizarding and superhero values.
Harry's character would be more attuned to the deeper magics. He would be less likely to jump into things without thinking. Since Flamel is a master of alchemy, Harry might be more interested in the scientific aspects of magic. He would also have a greater respect for life and magic's power, as Flamel, with his long life, would instill in Harry a sense of wonder and caution about the forces they deal with.
He'd be more disciplined. His character would be shaped by military values. He'd be less likely to act impulsively and more likely to think things through strategically.
He'd be tougher. Hiei's no - nonsense attitude would rub off on him. Harry would be more likely to take risks without hesitation.
The plot might involve the Justice League finding a way to incorporate magic into their understanding of the world because of Harry. For example, the Flash could be curious about how Harry can apparate and might try to find a scientific explanation for it. Aquaman could teach Harry about different forms of communication, as he has his own unique way of communicating underwater. As Harry grows, he might use the Justice League's resources to fight against the Death Eaters. He could bring some of the League's technology into the wizarding world, which would change the dynamics of the fight against Voldemort.
His character might become more confident. Growing up with the Greengrass family, he may not face the same kind of abuse as with the Dursleys. So, he could be more self - assured from the start. For example, he might be more willing to speak up in class.
His character might develop in a more self - interested way. Growing up with the Malfoys, he may not have the same selfless hero complex as in the original. He could be more focused on protecting his family (the Malfoys) and their status in the wizarding world.
His character would become more rugged. Instead of the somewhat sheltered and naive Harry we see at the start of the original series, he'd be tough - minded. Burt Gummer's influence would make him more of a fighter from the get - go.
Harry Potter's character would likely develop a stronger sense of independence. Since Jack Frost is often portrayed as a solitary figure, Harry might learn to rely on himself more. He could also develop a sense of wonder for the natural elements, especially ice and snow. His values might shift towards a more elemental view of magic, and he might be less interested in the politics and social hierarchy within the wizarding world. His sense of justice could still be strong, but it would be more in line with the unyielding nature of ice, being very firm and unwavering.
Harry's character would be shaped by Sirius' values. Sirius values loyalty above all else, and Harry would grow up with a deeper understanding of what it means to be loyal to friends and family. He would also be more in touch with his emotions. Sirius, having suffered so much, would encourage Harry to express his feelings. This would make Harry a more well - rounded and emotionally intelligent character compared to the sometimes stoic Harry in the original series.
Another concept is that the magic from the Harry Potter series starts to seep into the DC universe where the Justice League operates. This causes chaos as the laws of physics in the DC world are disrupted. The Justice League has to seek help from Hogwarts professors to understand and contain this new form of magic energy. Superman might be intrigued by the idea of magic being a new power source or a new threat he can't easily overcome with his super strength.