His magical education would likely be more hands - on. Dresden is often in the thick of things in his world, so Harry Potter would probably get real - world experience much earlier. Instead of just learning from textbooks in a classroom, he'd be out there facing actual magical threats and learning on the job.
In this fanfiction scenario, Harry Potter's magical education would be very different. Dresden's magic has a more practical and survival - based aspect. Potter would be taught how to sense magic in a different way, perhaps more like how Dresden does it, which is more instinctual. He would also be exposed to different types of magical beings much earlier. Instead of just learning about house - elves and goblins in a theoretical way at Hogwarts, he could be interacting with them in real - life situations under Dresden's guidance. And his concept of magic as a force that needs to be respected in a different sense, not just as a tool for doing spells, would be much stronger.
His magical education could be more group - oriented. Japanese culture values group harmony, so there might be more group projects and collaborative learning in magic classes compared to Hogwarts. For example, when learning complex spells, students might work in teams to master them.
He'd probably be more sophisticated. The Delacour family is known for their elegance and grace. Harry might have a more refined way of speaking and acting compared to his canon self. For instance, he would be more likely to use formal French wizarding greetings.
His personality would likely be more reserved and calculating. Growing up with the Malfoys, he'd be taught to keep his emotions in check and think before acting. He might be more aloof towards others outside of the pure - blood circle at first.
If raised by Newt, Harry's ability to sense the emotions and needs of magical creatures would be enhanced. This is because Newt has a great understanding of these aspects. Harry might also develop unique magical abilities that are specific to interacting with the habitats of magical beasts, like being able to create or modify suitable environments for them with magic.
Harry's magic could be stronger. Dorea's influence and knowledge of magic could have allowed Harry to tap into his magic potential more easily. Maybe he would be able to perform advanced spells earlier. Also, his magic might have a different 'flavor' so to speak. Since Dorea comes from a different magical background than the Dursleys, Harry's magic could be more attuned to the traditional wizarding ways of magic use.
He might be more traditional in his magic use as his grandparents would likely teach him older spells. Also, he could be more family - oriented since he was raised by family. He might be less impulsive as his grandparents could have instilled more patience in him.
He'd probably be more confident. Growing up with Lily, he'd have a strong female role model. He'd likely be more in touch with his emotions as Lily would encourage him to express himself. Also, his magical abilities might be more refined from an early age as Lily could start teaching him basic magic earlier than he learned in the original story.
He might be more feral. Growing up with a monster, he could lack some of the social graces that a normal upbringing in the wizarding world would provide. He may be more direct and less concerned with propriety.
He might be more laid - back. Canadian culture is often seen as more relaxed, so Harry could have a calmer demeanor. He wouldn't be as quick to get into arguments or be as impulsive as he sometimes was in the original story.
His Hogwarts experience would likely be very different. For one, he might be more physically fit and confident in combat situations. He could be less intimidated by the likes of Snape or Malfoy, as the Dragon Slayer would have taught him to stand up for himself. Also, he might introduce some new skills to Defense Against the Dark Arts, like dragon - slaying techniques adapted for magical creatures.