Another idea might be a fanfiction where Daenerys Targaryen and Jon Snow meet much earlier in the story. This could completely change the political dynamics in Westeros as they could potentially form an alliance much sooner and face their enemies together.
A really cool plot could be about a character from Essos coming to Westeros with a completely different magic system. This new magic could either be a great help in the wars or a new threat that all the Westerosi factions have to deal with.
One interesting plot idea could be exploring what would happen if a minor character, like Gendry, became a key player in the fight against the White Walkers. He has the skills and the unknown parentage which could be a great source for new storylines.
Well, you could write a fanfic where the White Walkers are not the pure villains. Maybe they have a more complex reason for their southward march. For example, they are actually fleeing from something even more terrifying in the far North. Also, a fanfic about a love story between a Stark and a Lannister could be interesting, exploring how their families' enmity affects their relationship.
A fanfic could also center around a maester who discovers a long - forgotten prophecy that has the potential to change the course of the entire story. This maester then has to decide whether to share the prophecy or keep it hidden, as it could cause chaos if it fell into the wrong hands.
Well, a possible plot for 'fire and ice twilight fanfiction' could be centered around a love triangle that involves a Twilight character, like Bella, and two characters from the 'fire and ice' universe. Maybe she gets caught in the middle of a power struggle between a noble from a powerful 'fire and ice' family and a mysterious figure who has some sort of magic related to ice. This could lead to all sorts of drama, with Bella having to navigate the different cultures and rules of both worlds while also dealing with her own feelings for these two very different individuals.
One idea could be to explore a different path for a minor character. For example, what if a servant in King's Landing had a secret ability to communicate with animals and used it to gather intelligence. Another could be a story where the magic in the world of Ice and Fire has a different origin than what is known in the original series. Maybe it was brought by an ancient alien race that visited Westeros long ago.
One idea could be that Hiccup and Elsa accidentally meet in a magical realm between their two worlds. They discover that their powers of ice (Elsa) and dragon - taming (Hiccup) are somehow related to an ancient prophecy that involves saving both of their kingdoms from a common threat, like a powerful fire - breathing monster that is immune to normal attacks but can be weakened by the combination of ice and the special bond Hiccup has with his dragon.
One idea could be a dragon with fire powers being forced to team up with a dragon with ice powers to stop a common enemy in the Naruto universe. Maybe an ancient evil that can only be defeated by the combined forces of fire and ice. Another plot could involve a ninja who has a special connection to these dragons and has to learn to control their powers to protect their village.
A great plot could be about a region that is split into two parts, one dominated by Fire Pokemon and the other by Ice Pokemon. A young trainer travels between the two, trying to bring peace and unity. Along the way, they encounter unique Fire and Ice Pokemon species and learn about the deep - seated rivalries and how to overcome them.
A cool 'Fire and Ice Pokemon fanfiction' could involve a trainer who has a special bond with both a Fire - type and an Ice - type Pokemon. The trainer enters a tournament where they face opponents with Pokemon that have a type advantage over either the fire or ice one. But through clever strategies and the unique synergy between the two Pokemon, they manage to win. For example, using the ice Pokemon's defensive moves to protect the fire Pokemon while it charges up a powerful attack.
One idea could be that the Lego Naruto characters discover a hidden land where fire - breathing and ice - breathing dragons live. They have to form alliances with these dragons to stop an evil force that is trying to take over both the Naruto world and the dragon's land.
A great plot could be about Natsu and the ice dragon slayer (let's say a new character) teaming up to defeat a powerful dark wizard. They have to overcome their differences in magic types and personalities at first. Maybe the ice dragon slayer has a cold and reserved nature compared to Natsu's hot - headedness. As they fight together, they learn from each other and create new combined attacks. For example, Natsu could use his fire to heat up the air around the ice dragon slayer's ice attacks, making them more powerful and unpredictable.