Harry's sense of justice would still be there but might be expressed differently. As Jon Snow, he'd be more likely to take matters into his own hands in a more direct way. For instance, instead of relying on the Ministry of Magic's laws like he did in the wizarding world, he'd be more of a lone wolf in Westeros, making his own decisions on what's right and wrong. He'd also probably be more reserved in showing his emotions, as Jon Snow was not one to wear his heart on his sleeve.
Well, Harry was used to having friends and a support system at Hogwarts. As Jon Snow, he'd be more solitary. This could make his personality more self - reliant. He might not trust as easily as he did in his previous life. Also, his loyalty would be more complex. In the wizarding world, he was loyal to his friends and Dumbledore's cause. As Jon Snow, his loyalty would be divided between the Night's Watch, his family (both the Starks and his new - found relations), and the greater good of Westeros. His experiences as Harry Potter would still influence him, but the harsh environment of Westeros would shape him into a more hardened and perhaps more calculating individual.
He'd probably be more timid at first. Tsuna is known for being a bit of a wimp in the beginning, and even though Harry has his own insecurities, being in a new world and a new body might make him even more hesitant. But as he gets used to things, his brave side from his past life would start to show more. He'd still have that sense of justice and a willingness to protect his friends, just like he did in the Harry Potter world.
Harry's bravery, which was one of his most prominent traits, would be very useful in the often - dangerous world of Westeros. He might be more willing to take risks than the average Targaryen. His kindness too would play a role. He could be the one to show mercy in a world where mercy is sometimes seen as a weakness. He would probably adapt his Hogwarts - learned values to fit the different cultural context of Westeros.
Loki's mischievous nature would definitely make Harry more of a prankster. Instead of just being the Boy Who Lived, he'd be the Boy Who Pranked. He might play tricks on Malfoy and his cronies more often and in more elaborate ways.
His confidence would still be there but might be a bit more subdued as he adjusts to the new world. He's used to being a big shot among demigods, but in Hogwarts, he has to start from scratch.
He might become more outgoing. In the Naruto world, the culture is different from the rather formal and often secluded wizarding world. Harry would be exposed to a more boisterous and open - minded society, so he could become more extroverted and less reserved.
Harry Potter's character traits would experience a significant transformation if reborn as a Lannister. His Gryffindor - like bravery would be channeled into different areas. He might be more cautious in showing it as the Lannister family values a certain level of political savvy and image - management. His kindness, which was a big part of his character in the wizarding world, would be tested. He would be surrounded by a family that often used more cut - throat tactics. But he could also bring a new perspective to the Lannisters. Maybe he'd introduce a more egalitarian way of thinking within the family, slowly changing their view on power and status. His ability to make friends, which was so important in his previous life, would now be about making allies within the complex political landscape of Westeros.
Well, Harry's personality would be a blend of his old self and his new Uchiha nature. He'd likely be more intense. The Uchiha are known for their strong emotions and passion. Harry might become more focused on achieving power to protect those he cares about, which was also a part of his personality as Harry Potter, but it could be amplified. He might also develop a bit of an air of mystery, as Uchiha are often seen as mysterious in the Naruto world. His sense of humor might change too, becoming a bit drier perhaps, more in line with the stoic nature of some Uchiha.
One possibility could be that he would bring his magical skills into the world of Westeros. He might use magic secretly to gain an edge in battles, like creating distractions or protecting himself and his allies. For example, he could use a shielding charm during a skirmish with the wildlings.
He might become more reserved. Shinobi are often taught to keep their emotions in check, so Harry would be less likely to be as openly angry as he sometimes is in the original story.
His personality would be more aggressive. Yautja are hunters, and growing up with them, Harry would adopt their aggressive nature. He would be more direct in his actions and less likely to hesitate.