Harry's personality would be a far cry from the innocent and somewhat naive boy in the original series. He would be more worldly in a dark sense. His sense of humor might be more sardonic. He'd be more likely to take risks without considering the consequences as much, as Lucifer's influence would make him more fearless, but also more reckless. He might also be more secretive about his true intentions and feelings, as he'd be used to a more cut - throat environment under Lucifer's care.
His personality would likely become more complex. He could be more withdrawn in some ways, as he might not fully trust others easily. Since Lucifer is associated with power and manipulation, Harry might also show tendencies to manipulate situations to his advantage. He would have a different view of loyalty, perhaps seeing it more as a tool for his own ends rather than an inherent virtue.
He'd likely be much more morally ambiguous. Harry would probably have less regard for the rules and traditions of the wizarding world.
His personality would likely become more bold. Wonder Woman is known for her fearless nature, and the fan might encourage Harry to be more like that.
His personality would likely be more cold and calculating. He'd be used to getting his way through underhanded means taught by the villains.
His personality might become more alluring like the Veela. He could be more confident in his appearance and charm, which is different from the somewhat self - doubting Harry in the original story. He may also be more in tune with his emotions as Veela are known for their passionate nature.
He'd be more reserved. Vergil isn't exactly a talkative and outgoing person. Harry would likely follow suit, keeping his thoughts and feelings to himself more often.
Harry's personality would be a lot more complex. Instead of the somewhat naive and overly - trusting Harry we know, he would be more calculating. Loki's influence would make him question people's motives more. He would also be more confident in his abilities, not just relying on his friends all the time. He might have a darker sense of humor too, given Loki's nature. And his sense of loyalty could be more conditional, depending on what he could gain from a relationship.
His personality might become more reserved. Growing up with a Shinigami would expose him to different values than the normal wizarding ones. He might not be as quick to trust or be as carefree as in the original story. Instead, he'd be more cautious and perhaps a bit more brooding, always thinking about the deeper meaning of things and the consequences of actions.
His personality would be greatly influenced by the forest environment. He would be more wild and free - spirited. Growing up away from the constraints of wizarding society, he would have a different set of values. He would be more empathetic towards animals and nature, seeing them as equals rather than something to be used. He would also be more solitary at first, but once he meets others, he would form very deep and loyal relationships as he values connection on a deeper level.
Harry Potter's personality would be drastically altered. Growing up with Azazel, he would lack the warm and nurturing environment that shaped the original Harry's kind - hearted nature. He might be more aloof and detached from others. Instead of being the hero who stands up for the weak, he could be more interested in using his power for his own gain. His sense of right and wrong would be blurred, influenced by Azazel's amoral ways, and he may not hesitate to use dark means to achieve his ends.
He might be more arrogant. Growing up with the Malfoys, he'd be used to thinking his family was superior. He'd lack the humility Harry in the original series has.