The use of a rapier could make Harry more confident in physical combat situations. In the original stories, he mainly relies on magic. But with the rapier, he has to depend on his own physical skills and reflexes. This could lead to a more self - assured Harry, who is not afraid to face danger up close. For example, he might be more willing to engage in a fight without immediately reaching for his wand. He could also become more strategic as he has to think about how to combine his magic with the use of the rapier in combat situations.
It might make him seem more refined. Using a rapier is a rather elegant form of combat compared to just using a wand for spells. So it could give Harry an air of sophistication.
In the fanfiction, there might be a duel with a dark wizard. Harry, with his rapier, would be able to make quick jabs and parries. The rapier's lightness allows him to move it with great speed, giving his opponent little time to react. He could use it to deflect spells and then counter - attack, making it a very dynamic combat scene.
The use of a bow by Harry Potter might change the plot by adding an element of surprise for his enemies. Magic is expected in the Harry Potter world, but a bow is a more Muggle - like weapon. His enemies, used to countering magic, would be caught off - guard by his use of a bow. This could give Harry an advantage in battles and change the overall course of the story, perhaps leading to quicker victories in some cases.
The staff could make him more confident. If it has powerful magic, he would feel more capable of taking on difficult tasks. So, his character might shift from being a bit hesitant to more assertive.
It could change his life by giving him a new form of magic. For example, he might be able to combine the power of the stand with his existing magic, making his spells more powerful.
Well, it could be that Naruto discovers a rapier in some ancient ruin during one of his missions. He decides to train with it secretly, adding a new and unexpected fighting style to his arsenal. This new weapon might give him an edge against stronger opponents, like some of the Akatsuki members.
I'm not sure of a specific 'naruto uses a rapier' fanfic off the top of my head. You could try searching on fanfic platforms like FanFiction.net or Archive of Our Own. They have a vast collection of Naruto fanfics and you might be able to find one that features Naruto using a rapier there.
In the original world, magic is the main tool for everything. But in 'Harry Potter uses technology fanfiction', technology and magic start to blend. This can lead to new forms of magic - tech hybrids. For example, a broomstick that is powered by both magic and some sort of technological engine, allowing for faster and more efficient flights. It also changes the social structure as wizards who are more tech - savvy gain new advantages and status.
He might become more in tune with nature. Since the Phoenix is a symbol of rebirth and nature in the wizarding world, Harry could develop a stronger sense of environmental magic. For example, he could be able to communicate with other magical creatures more easily, not just the Phoenix.
It can make him more of a physical combatant. Instead of relying solely on his wand, he becomes more hands - on. This can show a more assertive side of Harry.
He becomes more humble. Elves are used to serving and being in a subservient position. Growing up with them, Harry would learn the value of every being, no matter their status. He'd be less likely to show off his magical abilities like he might have in the original story.