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.
One possible plot could be that Harry discovers a hidden chamber in Hogwarts that contains a magical bow and arrow. He then has to learn how to use it to defeat a new dark force that is immune to magic spells.
It could be a family heirloom. Maybe it was passed down from one of his wizarding relatives who had an interest in Muggle weapons or had some sort of connection to a non - magical culture. This heirloom bow might have some hidden magical properties that only Harry discovers when he starts using it.
In some fanfictions, Dumbledore might bow out of respect for a powerful magical entity or a person with extraordinary abilities. It could also be a sign of his humility in the face of a situation where he realizes he is not the most knowledgeable or powerful.
Yes, there are some. You can find them on various fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Harry Potter uses a bow and arrow' in the search bar and you'll get a list of relevant stories.
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.
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.
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.
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.
One interesting plot twist is when the bow and arrow are actually a key to an ancient wizarding prophecy. In a particular fanfic, Harry finds this old, dusty bow in a hidden chamber. Little does he know that it's tied to a prophecy that could change the fate of the wizarding world. It's a great twist because it takes something as simple as a weapon and turns it into a major plot device.
There might be a 'Harry Potter' bow fanfiction where a new character is introduced who is an expert archer and has a magical bow passed down in their family. This character could then get involved in the main plot, perhaps helping Harry and his friends in their fight against Voldemort. For example, they could use their bow to take out Death Eaters from a distance in a very creative way.