Well, in theory, it could. Fanfics often like to blend different fictional universes. However, in the official Harry Potter lore, there are no lightsabers. But in a fanfic, an author could come up with some creative magic or a cross - universe event that brings lightsabers into the wizarding world. Maybe a powerful wizard discovers a way to create a weapon similar to a lightsaber using magic and some rare materials.
Wall and wall were two common terms in architecture. They were different in function and structure. A wall was a city wall or fence built with earth, stone, bricks, and other materials. Its function was to separate space, protect, and bear weight. The walls generally did not have a closed top, so they could climb over them. The wall was a barrier made of earth, stone, bricks, and other materials inside the house. It was tightly connected to the roof or ceiling to separate the inside and outside space. The walls were usually sealed, and one could not climb over them.
The definition and difference between walls could be deduced. The walls mainly consisted of bearing walls and non-bearing walls, which served as a protective barrier and space partition. The wall must have sufficient strength and stability, as well as heat preservation, heat insulation, sound insulation, fire prevention and waterproof capabilities. There were many types of walls, and they could be made of a single material or a composite material. A wall was a type of wall, a barrier inside a house. It was connected to the roof or ceiling to separate the inside and outside of the house.
To sum up, a wall referred to a city wall or fence built with earth, stone, brick, and other materials to separate space, protect, and bear weight. A wall referred to a barrier built with earth, stone, brick, and other materials inside a house. It was tightly connected to the roof or ceiling to separate the inside and outside space.
He could find it during one of his missions. Maybe he's exploring an ancient ruin and stumbles upon the lightsaber. It could be in a chest or just lying there, and Naruto, being curious, picks it up.
Pikachu would probably be very curious. It might zap the lightsaber a bit to see what would happen, and then be in awe of the bright blade. It could also get a bit protective of Ash when he wields the lightsaber, as if it senses the added danger.
Perhaps it's given to him by a mysterious figure. This figure could be from another dimension or a very old ninja who has been in hiding for a long time. They recognize Naruto's potential and power, and decide that he is the one worthy of wielding the black lightsaber. This could be part of a bigger plan to help Naruto defeat a new and powerful enemy that neither the ninja world nor the normal means of combat can handle.
Naruto's fighting style would likely incorporate more acrobatic flips and spins to take advantage of the lightsaber's reach. He'd also use his shadow clone jutsu in new ways, like having clones surround an enemy while he attacks from above with the lightsaber.
Perhaps a lightsaber is discovered in a hidden part of Hogwarts, and it has some sort of ancient magic that is tied to the fate of the wizarding world. The characters then have to figure out how to use it, or how to keep it out of the wrong hands. They might also need to learn how it works, which could lead to some comical moments as they try to figure out things like how to turn it on and off, all while being chased by dark wizards who also want the lightsaber.
I think Hermione would be the most likely. She's very intelligent and a quick learner. She would study all the available information about lightsabers, probably find some ancient texts in the library about similar weapons. With her determination and knowledge - seeking nature, she'd be able to master the basic techniques of lightsaber handling in no time.