It could be used as a plot device to bring characters from both universes together for a common mission. Say a powerful villain has hidden important items in both the Naruto and Harry Potter worlds, and the Portkey allows Harry and Sasuke to travel between the two to retrieve them all. They would have to rely on each other's unique skills to succeed.
The Portkey could also be used to create a mystery in the fanfiction. Maybe it keeps malfunctioning and sending characters to random places in both universes. Harry and Sasuke then have to figure out how to control it while also dealing with the strange new environments and characters they encounter along the way.
Perhaps a fanfiction where Sasuke discovers a Portkey in his world that leads him to Hogwarts. He has to adapt to the new magical environment and forms an unlikely friendship with Harry Potter. Together, they explore the secrets of both their worlds and use their combined skills to face challenges.
The portkey could be significant as it might be a way to quickly transport Harry to a crucial location, perhaps a place where he can find important information or an item needed to defeat the Dark forces. For example, it could lead him to a hidden library or a secret weapon stash.
The plot could change significantly. For starters, his initial reaction to the portkey journey and arrival would be different. Instead of quickly taking in the scene, he'd be fumbling around. This could lead to him being left behind by his companions if they're in a hurry. Also, if there's a mystery to solve at the destination, his impaired vision might make him overlook crucial clues that are visible only to those with good eyesight.
At first, Sasuke would probably be very guarded. But Harry, being friendly, would try to break through that. Harry would show Sasuke around Hogwarts, and Sasuke might be a bit dismissive at first, thinking his ninja skills are superior. But as he sees the power of magic, he'd start to respect it. They would have conversations where Harry tries to understand Sasuke's past traumas, and Sasuke might be hesitant to open up. However, over time, they would bond, especially when facing a common enemy. Harry would use his quick thinking and magic, while Sasuke would use his combat skills.
Maybe it's a piece of parchment. Hermione is always associated with books and parchment, so it would make sense for her to turn a piece of parchment into a portkey. It could have some magical writing on it that is related to the destination or the purpose of the portkey.
One way could be through the use of anti - magic spells like 'Finite Incantatem'. This spell, which is used to stop other spells in the original series, could be made more powerful or have wider applications in fanfiction. For example, a powerful wizard in a fanfiction could cast a large - scale 'Finite Incantatem' to block all incoming magic in a certain area.
The Basilisk fang wand could be used to explore the Forbidden Forest in new ways. Since Basilisks are powerful and feared creatures, the wand might allow the wielder to communicate with some of the more dangerous and intelligent forest dwellers, like the centaurs or the Acromantulas in a unique way that normal wands can't.
Well, perhaps the plot could be that Harry discovers a hidden portal that leads to the Naruto universe. There, he meets Sasuke and becomes fascinated with his skills. He decides to learn from Sasuke and in the process, tries to combine magic with ninja techniques.
Well, perhaps Harry could find Sasuke in a strange magical realm that connects the Naruto world and the wizarding world. Harry, being the kind - hearted person he is, decides to take Sasuke under his wing. He could introduce Sasuke to Hogwarts, and Sasuke might be amazed by the magic there. He would learn spells instead of ninjutsu, and they could have adventures together fighting against dark wizards who might be interested in Sasuke's special powers.
They might be used as a key plot device. For example, if 'intos' is a spell, it could be used to solve a major problem in the story.