Harry's personality would develop in a very different way. Growing up with Sirius and Remus, he'd be constantly surrounded by tales of the Marauders. This would make him more mischievous in a good way. He'd have a better understanding of the grey areas in life, as Sirius has a bit of a wild side and Remus has his own struggles. Harry would also be more independent, as Sirius and Remus would encourage him to think for himself and not blindly follow rules. He'd be more likely to question authority, especially when it seems unjust. And his sense of humor would be more developed, as Sirius is known for his jokes and pranks. Overall, he'd be a more well - rounded and confident young wizard.
Harry would probably be more rebellious. Remus and Sirius are not exactly the rule - following types. They've both had run - ins with the law in the wizarding world. So Harry would grow up seeing that sometimes breaking the rules is necessary for doing what's right. He might be less hesitant to take matters into his own hands.
Harry would likely be more confident. With Sirius as his sole guardian in France, he'd be away from the Dursleys' abuse. Sirius would encourage Harry to be bold and fearless, and without the constant pressure of the British wizarding community's expectations, Harry could be more laid - back and easy - going.
Harry would likely be more conflicted. With Bellatrix's influence, he might have a darker edge to his personality. He could be more aggressive in his approach to problems. Sirius, on the other hand, would try to keep him on the right path, so there would be an internal struggle. He might not be as quick to trust as the original Harry, but more cautious and calculating.
Harry would likely be more confident. Sirius is a bold and brave character, and growing up with him would instill those qualities in Harry more strongly. He wouldn't be as meek as he was in the early days at Hogwarts.
One possible plot could be that Harry grows up with a stronger sense of family. Sirius and Remus would teach him about his parents more directly. He might be more confident in his magic earlier, as they could start his training sooner. Also, he'd likely have a different view of werewolves and Animagi from an early age.
He might be more reserved and empathetic. Remus is a rather quiet and introspective character, and Harry would likely pick up on those traits. He'd be more understanding of those with differences, like werewolves, given Lupin's condition.
His personality would likely be more introverted. Itachi was a rather quiet and introspective person, and this trait would rub off on Harry. Harry would probably be more cautious in his actions and less impulsive.
His personality would be more noble. Aslan is a symbol of nobility and righteousness. Harry would likely inherit those traits, being more selfless and having a stronger sense of justice. He'd be more like a natural leader.
If raised by Xander, Harry would be more street - wise. Xander has had to fend for himself in a tough world. Harry would pick up on that. He would be less naive about the world around him. His sense of right and wrong would also be influenced. Xander has a moral code that is a bit more flexible than the strict wizarding world's. Harry might be more willing to break the rules if it means doing the right thing in a more complex situation. For example, he might be more likely to help a dark wizard who has been wrongly accused, rather than just following the Ministry's orders blindly.
If Harry was raised by Sirius, his personality would be more rebellious. Sirius was always against the traditional ways of the wizarding world. Harry would be influenced by this and might question authority more often. Also, he would be more confident as Sirius would encourage him to be himself and use his talents. Harry would grow up with a stronger sense of self - worth, knowing that he was loved and supported by Sirius.