Harry's personality would be a blend of his original kind - hearted self and Kenpachi's rough - and - tumble nature. He would still have his sense of justice, but it would be expressed more violently. He might not be as diplomatic as in the original series. For instance, when dealing with the Ministry of Magic's bureaucracy, he wouldn't play by their rules and would be more likely to challenge them head - on. His sense of humor would also be more wry and sarcastic, a bit like Kenpachi's nonchalant attitude towards most things. And he would be more self - reliant, not waiting for others to come to his aid but rather charging into situations and expecting others to follow his lead.
His personality would be much more aggressive. Kenpachi is known for his love of battle, and Harry would inherit some of that. He might be more eager to prove himself in dangerous situations. Instead of relying on his friends as much as in the original story, he would be more likely to take on challenges alone. He would also have a more devil - may - care attitude towards the rules of Hogwarts, which could get him into more trouble but also make him a more interesting character. He would be less patient and more impulsive, ready to jump into action at any moment.
Harry would likely be more fearless and brash. Kenpachi is a bold and fearless fighter, and his influence would make Harry less hesitant. For example, when facing a bully like Draco, Harry might immediately react with physical force rather than just trading barbs. He would be more upfront and direct in his approach to problems.