Well, if Harry Potter wields a staff in fanfiction, it could potentially enhance his spell - casting range. For example, he might be able to send spells further across the Hogwarts grounds. Also, it could make his magic more precise, like when he's aiming at small, fast - moving targets. And perhaps it gives him access to new types of magic that are more closely associated with staves, such as ancient spells that were lost over time but are reawakened through the power of the staff.
The staff could transform his magical abilities quite a bit. Firstly, it could boost his defensive magic. He might be able to create stronger shields that can withstand more powerful attacks. Secondly, his offensive spells could gain new properties. For instance, his Stunning Spell could have a wider spread or be more difficult to resist. Lastly, it could give him an edge in dueling. He would be more unpredictable as his opponents wouldn't be used to him using a staff, and he could combine the staff's unique powers with his regular spellcasting skills.
One interesting storyline could be that the staff is actually an ancient artifact that was hidden away for centuries. Harry discovers it and as he wields it, he starts to uncover secrets about Hogwarts' past that were long forgotten. Another could be that the staff has a mind of its own and it guides Harry on a quest to defeat a new dark wizard that Voldemort had been secretly training before his death. It could also be a story where the staff gives Harry the ability to travel through time, and he has to go back to different eras in the wizarding world to correct mistakes that were made in the past to ensure a better future.
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.
The fanfiction might change the plot in terms of Harry's relationships. Maybe his new ability with the Nuibari makes some of his friends jealous or in awe of him. Also, it could attract the attention of new characters or factions who are interested in the Nuibari. This could create new alliances or rivalries for Harry. For example, some dark wizards might want to steal the Nuibari from him, leading to new conflicts. And in his journey to master the Nuibari, he might have to visit new places or seek help from unexpected sources, thus diverging from the original plot.
When Harry Potter wields Excalibur in fanfiction, the story's power balance shifts. Excalibur's power is not just physical but also has a sort of magical aura. This could enhance Harry's own magical presence. It might lead to new adventures as he tries to understand the sword's full capabilities. He may also face new enemies who are interested in the sword. For instance, ancient magical beings who have a connection to Excalibur might come into play. And his relationships with his friends could also change as they adjust to this new, more powerful Harry.
It could be Dumbledore. Dumbledore is always full of surprises and he might give Harry the staff as a last - resort weapon to fight against Voldemort. He could have been secretly researching the staff and its powers and decided that Harry was the only one who could wield it properly.
A custom staff could also make Harry more responsible. If the staff is very powerful, he would need to be careful not to misuse it. This would lead to him being more cautious and thinking more about the consequences of his actions, which in turn would shape his character in a more mature way.
It could be an ancient relic passed down from a long - lost wizarding clan. Maybe it was hidden away for centuries until Harry discovers it by chance.
The different wand might change his abilities in terms of spell specialization. Say the new wand has a different wood that is attuned to certain types of magic. If it's a wand made of willow, which is often associated with healing magic, he could find himself more proficient in healing spells, even if he wasn't before. This would be a significant shift in his magical abilities as he would be able to contribute in a different area of magic within the wizarding world.
Perhaps it's a time - traveling wizard from the future who knows that Harry will need this staff to save the wizarding world at a crucial point. The time - traveler realizes the importance of the staff in Harry's hands and decides to gift it to him. Another possibility is that it's a magical creature in disguise. This creature, having a deep connection to magic and prophecy, presents the staff to Harry as a means of fulfilling a greater purpose in the wizarding world.
In this fanfiction, Harry Potter could obtain Gungnir in a rather unexpected way. For example, due to a time - traveling incident. He might accidentally travel to a different time and place where Gungnir exists. There, he could be in a situation where he has to help the local magical community. As a result of his heroic deeds, the keepers of Gungnir decide to entrust him with it. And when he returns to his own time, he brings Gungnir with him, ready to use it in his fight against the dark forces.