In this fanfiction, Harry Potter might be transported to an alternate dimension where the rules of magic are different. There, he meets beings who teach him about Gaster Blasters and how to use them. He then brings this new knowledge and power back to his own world. When facing Voldemort, instead of using traditional spells like Expelliarmus or the Killing Curse, he uses the Gaster Blasters, which are far more powerful and devastating. This could lead to a whole new take on the Harry Potter series' final battle.
If Harry Potter uses Gaster Blasters in a fanfiction, it could change the very fabric of the magical society. First, the perception of what is possible in magic would change. No longer would wands and incantations be the only means of power. Second, the balance between good and evil could be severely disrupted. Harry's new power could make the fight against Voldemort much easier, but it could also lead to new threats emerging as others might seek to gain the power of the Gaster Blasters. Third, the magical creatures in the wizarding world might react differently to Harry. Some might see him as a new kind of threat, while others might see him as a potential ally in a changing world.
A plot could be that Gaster has a connection to the Forbidden Forest in Harry Potter. He might be the source of some of the strange and dangerous creatures there. As Harry and his friends explore the forest more, they start to notice Gaster's influence. Gaster could also be using the forest as a way to try and get back to his own world or to gain power in the Harry Potter universe. This would lead to a series of adventures and battles as the characters try to either stop Gaster or understand his motives.
One possible plot could be that G W Gaster somehow gets transported into the Harry Potter universe. He could bring with him some unique form of magic or knowledge that disrupts the normal order in Hogwarts. Harry and his friends would then have to figure out who this strange new character is and what his presence means for their world.
Well, perhaps Gaster has lost his memory and believes he is a wizard in the Harry Potter world. He could start to regain his memories slowly as he experiences different magical events. For example, when he encounters the Forbidden Forest, it could trigger some memories related to his own world. And the characters in Harry Potter would be both intrigued and cautious about this strange new 'wizard' who seems to have such different ways of using magic.
One possible plot could be that Voldemort discovers cybernetic technology and tries to use it to enhance his dark magic. Harry and his friends then have to learn about cybernetics quickly to counter this new threat. They might seek help from the Muggle world's experts in cybernetics.
One possible plot could be that Gaster somehow gets transported to the wizarding world of Harry Potter. He might initially be confused but then start to study the magic there. Maybe he tries to combine his own knowledge with magic, leading to some unique spells or potions. Harry and his friends could be both intrigued and cautious of this strange new character.
One possible plot could be that Harry discovers a hidden chamber in Hogwarts that contains a magical bow and arrow. He then has to learn how to use it to defeat a new dark force that is immune to magic spells.
One possible plot could be that during a battle, Harry is transported to a realm similar to the one in Unlimited Blade Works. There, he learns the art of Unlimited Blade Works and brings it back to Hogwarts. He then starts training his friends in this new form of combat. Together, they use it to defend Hogwarts against a new, powerful dark force that is immune to normal wizarding spells. The story could explore how they combine traditional magic with the new abilities, and how they face the challenges of using an unfamiliar power.
One plot twist could be that the gun is actually a magical object in disguise. It might have been created by a dark wizard who wanted to introduce an element of Muggle - like violence into the wizarding world. Harry discovers this as he tries to use it and realizes that it has powers beyond what he expected. Another twist could be that the use of the gun makes Harry an instant target for both the wizarding authorities and dark forces. He has to constantly evade capture while trying to figure out why the gun has such a strange allure and power.
Well, one possibility could be that in an alternate universe, Harry is magically de - aged and has to use a baby bottle for a while. Maybe he was hit by a strange spell during a battle, and his friends have to take care of him as if he were a baby. They might struggle to get him to drink from the bottle at first, but then find a special potion - flavored milk that he likes.