His magical abilities might develop in a different way. Without the formal training at Hogwarts from an early age, he could discover his own unique ways of using magic. Maybe he would combine his street - learned skills with magic, like using his knowledge of pickpocketing to quickly snatch a wand from an enemy. His magic would be more rough - around - the - edges but also more adaptable.
He develops a more rebellious streak. In the original, Harry was quite respectful of authority in the wizarding world. But being raised by bikers, he might question rules more often. For example, he might not be as quick to follow Hogwarts' strict regulations.
When Harry is in Slytherin in fanfiction, his view of the wizarding world may change. He may start to see the grey areas more clearly. Instead of seeing things as simply good or bad, he realizes that there are many factors at play. This makes him more complex as a character. He may also have to deal with the Slytherin legacy of the Dark Arts. He has to navigate through the temptations and warnings related to it. He might study some Dark Arts spells not to use them for evil, but to understand how to defend against them, which is a very different path from what he would have taken in Gryffindor.
In this fanfiction, Harry's development would deviate a lot from the original. His sense of right and wrong would be blurred. Since he's raised by devils, he may not have the same values as the normal Harry. He could be more self - centered, focused on his own survival and power gain rather than the well - being of others. His magical abilities might also develop in a more unorthodox way. Instead of learning the traditional spells for good, he might learn spells that are more harmful or controlling.
His character could develop in a way that he becomes more of a loner. With the pursuit of power, he might feel that his friends are holding him back. He could start to see the wizarding world in terms of those who have power and those who don't. This new perspective would change his relationships. He might form alliances with those he previously thought were untrustworthy, just because they can offer him a step closer to the power he desires.
He'd probably be more refined in his manners, as French culture often emphasizes politeness and etiquette. His accent would be different, of course. And he might be more confident in expressing his emotions, as the French are generally more open about feelings. Also, his view of magic might be more influenced by French magical aesthetics, which could be more about elegance and style.
His character might become more assertive and self - reliant. At Durmstrang, which has a different culture than Hogwarts, Harry would have to stand up for himself more often. He'd also learn different magical techniques, which could make him more versatile in his magic use.
Well, he might become more confident and self - assured. After all, defeating the most powerful dark wizard of all time is no small feat. He could also be a bit more somber, having seen the true horrors of the dark side up close.
His character would likely be more confident. Growing up with a loving mother like Lily, he wouldn't have the insecurities that came from the Dursleys' treatment.
Harry might be more self - assured. Charlus, being from an older time, could have a more no - nonsense approach to teaching Harry magic. This would make Harry more confident in his abilities. For example, he might not second - guess himself as much as he does in the original story.
His character might become more refined. Growing up in France, he could be exposed to a different set of social etiquettes, which would make him more polished in his interactions. For example, he would greet people more formally compared to his British counterparts.