In the fanfic, it's possible that Jon Snow uses his warging ability. He might warg into a large and fearsome animal, like a direwolf or even a wild boar. He could then send this animal into the middle of the Red Wedding chaos, causing enough distraction for him to step in and stop the massacre. He could also use his connection with the Northmen present, appealing to their loyalty to House Stark and the North, convincing them to turn against the Freys and Boltons.
In this fanfic, House Bolton would also suffer. Their alliance with House Frey was a key part of their plan to gain more power in the North. If Jon Snow stops the Red Wedding, their scheme fails. They would lose the support of many of their allies who were only in it for the chance to get on the winning side. For House Tully, they would be grateful to Jon Snow. Their family members were also at risk at the Red Wedding, and if Jon Snow saves them, it would strengthen the bond between House Tully and House Stark, potentially leading to future alliances and mutual support in the power struggles of Westeros.
In fanfiction, Jon Snow could avenge the Red Wedding by forging new alliances. He might seek out the support of powerful magic - users or forgotten kingdoms. With their help, he could bring a supernatural vengeance upon those who committed the atrocities at the Red Wedding. Maybe he uses magic to curse their lands, or summons some mythical creatures to attack their strongholds. This way, he not only gets revenge but also makes it a memorable and fitting punishment for the cruel act that was the Red Wedding.
In the fanfic, Naruto could potentially have some hidden power or connection that he uses to his advantage. For example, he might discover a long - lost prophecy that says the Uchiha are crucial for the future of the village. He then uses this knowledge to persuade everyone that the Uchiha should be spared. He might also enlist the help of his friends and allies, like Sasuke, to show a united front against the idea of the massacre.
Another possibility is that Loki teams up with other characters. He could form an alliance with the Avengers or some other powerful beings in the universe. Together, they could come up with a plan to stop Thanos. Loki could contribute his unique skills, like his ability to shapeshift and infiltrate Thanos' ranks, and then they could launch a coordinated attack.
Naruto could also use his new jutsu or skills he has acquired. He might show Sasuke that he has become stronger and that they could face whatever Sasuke is running from together. He could block Sasuke's path physically and then start talking some sense into him, like how leaving won't solve his problems but will only create more.
Harry Potter is a very resourceful wizard. He might first try to understand the nature of the Snap. He could use his invisibility cloak to get close to Thanos unnoticed. Then, he could use the power of the Elder Wand, which is the most powerful wand in the wizarding world. With a well - aimed spell from the Elder Wand, he could potentially break the connection Thanos has with the Infinity Stones and stop the Snap.
It depends on the specific fanfic. There are countless fanfictions out there, and while some may choose to give Jon Snow dragons to enhance his character or create a more fantastical story, others may stick closer to the original lore and not include such a plot element. So, you really have to dig into different fanfics to find out if he has dragons in them.
One way is through strategic warfare. He plans meticulously and attacks the enemies' weakest points. Another could be by using his Stark identity to rally the North against the traitors. He might also use his newfound knowledge from his experiences, like his time with the Wildlings, to outwit his foes.
In fanfiction, Harry Potter might stop the Red Wedding by using magic to create a diversion. For example, he could conjure up a horde of magical creatures that would disrupt the event and give the intended victims a chance to escape.
In fanfiction, Harry Potter might stop the Red Wedding by using magic. He could cast powerful spells to prevent the attackers from reaching the guests. For example, he could create a protective shield around the venue.