Well, he could use it to transform into different alien species and gain their powers. For example, he could turn into a strong and durable alien like Four Arms and be better at fighting Death Eaters. It would definitely change the whole dynamic of the wizarding world as his abilities would be a combination of magic and alien powers.
In a fanfiction where Harry Potter has the Omnitrix, he could use it to his advantage in many ways. The Omnitrix could give him an edge in battles against Voldemort and his followers. He could transform into aliens with unique magical - like abilities that wizards in the wizarding world have never seen before. For instance, he could transform into Upgrade and merge with magical objects to enhance their power. This would not only make him a more formidable opponent but also introduce a whole new concept of power in the wizarding world. His relationship with his friends and teachers would also be affected. Some might be in awe of his new powers, while others might be a bit skeptical or even scared at first.
If Harry Potter had the Omnitrix in fanfiction, it would be really interesting. He might first be confused about how to use it. But once he figures it out, he could use it for different purposes. Maybe he would use the XLR8 form to quickly escape from dangerous situations in Hogwarts. Or he could use Heatblast to warm up during cold winters in the wizarding world. And his friends would be both amazed and a bit worried about this new power he has.
Hermione would be extremely curious. She would immediately start researching it, trying to figure out its mechanics and where it came from. She might even try to find a way to improve it or adapt it to the wizarding world's technology.
Well, he'd probably be super OP. He could transform into all kinds of alien forms and use their powers in his battles. Imagine Naruto using Heatblast's powers to fight against Akatsuki members. It would be a whole new level of combat in the Naruto universe.
In this fanfiction, Naruto might use the Omnitrix to gain various alien forms' powers. He could use those powers to fight stronger enemies in the Naruto universe, like the Akatsuki members. Maybe he would use the powers for stealth or super strength depending on the alien form.
Well, it would be a really strange scenario. Magic and guns don't really go together in the traditional Harry Potter world. But if Harry had a gun, he might use it in a moment of extreme danger when his magic fails him. Maybe against some dark creatures that are immune to certain spells.
If modern weapons were introduced in Harry Potter fanfiction, it would add a whole new dimension to the story. Harry could use a sniper rifle with a scope enchanted to see through invisibility cloaks. This would give him an edge in combat. Also, modern military tactics could be incorporated. Instead of just relying on spells, they could set up ambushes using landmines (enchanted ones, of course) and other non - magical weaponry. It would make the fight against evil more complex and interesting.
In fanfiction, if Harry had a Nundu as a familiar, it could lead to a whole new set of adventures. The Nundu's strength and wild nature would attract the attention of both good and bad wizards. Harry would need to be extra cautious as having such a powerful and feared creature by his side could make him a target. He might have to train the Nundu to be less aggressive and more obedient. This could involve a long and difficult process. Also, the Nundu could help Harry in exploring new and dangerous places, like the Forbidden Forest, where other creatures might be afraid to go because of the Nundu's presence. It would be a fascinating concept to explore in fanfiction, full of potential for exciting storylines.
In a fanfiction where Harry Potter has the Infinity Stones, his life would take a completely different turn. First of all, the Space Stone would enable him to teleport anywhere in the wizarding world or even beyond. This would make it impossible for his enemies to catch him. The Soul Stone, on the other hand, might have some deep connection with the wizard's soul. Maybe it could help him understand the true nature of magic and his own destiny better. He could use all these stones' powers in combination to bring about a new era of peace and magic in the wizarding world, but he would also have to face the great temptation and potential corruption that comes with such immense power.
He might also be a bit confused at times. Some fanfictions deviate a lot from the real events in his life. For example, if there's a fanfiction where he has a completely different upbringing, it would be strange for him to read about. He could also feel a sense of flattery that so many people are interested in his story and want to create their own versions of it.
Well, perhaps the Omnitrix gets mixed up with the magic in Hogwarts. It starts malfunctioning and instead of the usual alien forms, it gives Harry forms of ancient wizards. He has to figure out how to control these new forms while also dealing with the mystery of why the Omnitrix is acting this way. And he might learn new spells and magic from these wizard forms.
If Harry Potter had Magneto's powers in fanfiction, it would completely transform his character. He might not rely so much on his wand for combat. Instead, he could manipulate the metal in the environment, like the suits of armor in Hogwarts. This would give him an edge in duels, as his opponents wouldn't be expecting such non - traditional magic. Also, it could potentially make him a target for those who fear powerful and different abilities, just like Magneto was in the X - Men universe.