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.
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.
Harry's personality could become more disciplined. Beerus is all about discipline in his training. So, Harry would have to follow strict rules. This could make him more focused and less impulsive in his actions, which is a big change from his sometimes reckless nature at Hogwarts.
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.
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.
He would become more rebellious. Harry has always had a bit of a rebellious streak in the original series, but as a pirate, it would be amplified. He'd be more likely to question authority and do things his own way without waiting for permission.
If Harry Potter was raised by Natsu, his personality would change drastically. Natsu is a very passionate and hot - tempered character. Harry would be influenced by this passion and would be more driven in his pursuits. He would no longer be the meek boy who was bullied by the Dursleys at the start. Instead, he would be more confident and assertive. His sense of justice would also be more like Natsu's, which is more about immediate action rather than following a set of bureaucratic procedures. He would probably have a stronger sense of loyalty towards his friends as well, because Natsu values friendship above all else and would instill this value in Harry.
His personality would likely become more brooding. Darth Vader's influence might make Harry more withdrawn as he grapples with the new and often dark teachings. He may lose some of his innocence and optimism.