Well, if Harry Potter wields Excalibur in fanfiction, it would be a wild combination. Harry is already a powerful wizard, but Excalibur is a sword of legend. It might change the whole dynamic of the wizarding world. For example, the sword could cut through dark magic in a way his wand can't. Maybe it would attract the attention of other magical creatures who respect the sword's power. And it could also create some interesting relationships with Arthurian legends within the Harry Potter universe.
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.
Dumbledore could also play a role. Even if he's not alive in the normal sense, his spirit or some form of his magic could guide Harry. He might have known about the connection between Harry and Excalibur all along and left behind some hints or instructions for Harry to follow.
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.
The dragon sword in the fanfiction might be long and slender, with a blade that shimmers like dragon scales in the sunlight. The hilt could be made of a dark, enchanted metal, perhaps with a dragon's head carved at the end, its eyes seeming to glow with an inner fire.
Well, if Harry Potter wields Mjolnir in fanfiction, it would be an absolute power explosion. Harry already has his magic skills from the wizarding world, and adding the power of Mjolnir would make him nearly invincible. He could use the hammer's lightning - based powers along with his spells, creating some really unique and powerful combat combinations. It would also change the dynamic of his relationships. His friends might be in awe, and his enemies would be even more terrified.
Well, it could be really cool. Yamato is a powerful weapon. Harry Potter is already powerful with his magic, but adding Yamato to the mix would make him almost unstoppable. He could use the sword's abilities along with his spells to defeat enemies in a very unique way. Maybe he could use magic to enhance the sword's power even further.
Obviously, Harry Potter is a main character as the heir of Excalibur. Hermione Granger would also likely be involved. She is always by Harry's side in the original series, helping him with research and providing intelligent solutions. So in this fanfiction, she might be the one to help Harry figure out the implications of being the heir.
Well, it could be that in a magical crossover world, Harry Potter somehow stumbles upon the fabled Excalibur. Maybe he's on a quest to defeat a new dark wizard who can only be vanquished with Excalibur's power. So, he has to prove himself worthy to pull the sword, just like in the Arthurian legends.
One idea could be that the Excalibur sword somehow finds its way into the wizarding world of Harry Potter. Maybe it's brought there by a powerful magical being from another dimension. The sword could possess unique magical properties that interact in strange ways with the existing magic in the Harry Potter universe, like being able to cut through any dark magic spell.