He would become more humble. Losing his magic would make him realize that he's not invincible. He'd start to value the people around him more. For instance, he'd be more grateful for Hermione's intelligence and Ron's loyalty.
The story could develop with Harry being shunned by some in the wizarding community. They might see him as a has - been or a disappointment. But he might also find a small group of allies who believe in him regardless of his lack of magic. They could help him find new ways to contribute to the fight against evil, like using his knowledge of magic to outwit dark wizards even without being able to perform spells.
Harry's character could develop into a more serene and centered individual. Lady Magic's influence could instill in him a sense of calm and purpose. He would not be as easily rattled by the challenges that come his way. For example, he might face Voldemort with a different kind of confidence, not just the courage that comes from his friends and Hogwarts, but from his own deep - seated connection to the very source of magic. This could also make him more empathetic towards magical beings, as he would understand the magic within them on a deeper level.
His magic might develop in a more instinctive and self - taught way. Without the guidance of Hogwarts professors, Harry would have to figure out his magic on his own. He might use it more for survival and self - defense against the threats that Jason's world presents. For example, he could use magic to create barriers or traps to keep enemies at bay.
His character might become more confident. Since he is one with magic, he has a newfound sense of power and purpose.
Harry's character would become more centered around self - improvement. Goku is always striving to get stronger. So Harry would constantly be looking for ways to improve his magical and physical skills. He might not be as reliant on his friends for support in difficult situations as he is in the original story, instead trying to handle things on his own more often. This could make him seem a bit more independent and self - sufficient.
His character would likely become more edgy and darker. Growing up with demons, he'd be exposed to a lot of negative and cruel things, which would change his view of the world.
He might be more solitary at first. Since ghosts are not as social as living beings in the traditional sense, Harry could be used to his own company. But as he gets to know the living world more, he would start to open up.
His character would likely be much more aggressive. Trigon's influence would push Harry to be more assertive and less hesitant. He'd probably have a quicker temper too.
His character would be more assertive. He'd be used to taking action quickly due to his Warrior upbringing. He might be less hesitant in difficult situations compared to the original Harry.
His character might become more confident and authoritative. Being a king, he has to make decisions for a whole nation, which would force him to be more assertive than he was at Hogwarts.