One possible interesting plotline could be the unique ways in which the characters in the North approach dragon - killing. Maybe they use ancient and forgotten techniques passed down through generations. Another could be the moral dilemmas they face when dealing with these majestic yet dangerous creatures.
I'm not sure specifically, but there could be a fearless warrior as a main character. He might be the one leading the dragon - killing expeditions in the North.
Well, one possible plotline could be about the dragons' struggle for survival in a harsh winter. Maybe they have to find new sources of food and shelter.
Another possible plotline is the discovery of a new breed of dragon that has the combined powers of fire and ice. This causes a stir among the existing dragon communities as they try to figure out what this new dragon means for their future. There could be a race among different groups to either control or protect this new dragon, leading to a series of adventures and challenges.
One possible plotline could be that Kushina is somehow mind - controlled or influenced by an evil force to harm Naruto. Maybe she's under a powerful genjutsu that makes her see Naruto as a threat to the village instead of her son.
One interesting plotline could be the rebirth of a powerful dragon with amnesia, having to rediscover its powers and past. Another might involve the dragon's new relationships with other mythical creatures in the fanfiction world.
One interesting plotline could be Natsu's struggle to fit in with human society after being raised by dragons. He might have different values and ways of doing things that clash with humans.
One interesting plotline could be the discovery of a new type of dragon with unique abilities. For example, a dragon that can change its color to blend into different environments, which adds a new layer of strategy in battles and hiding from enemies.
One interesting plotline could be Daenerys using her dragons to discover a hidden, ancient civilization. The dragons might lead her to a lost city filled with magic and secrets.
In some fanfictions, the King of the North might have to deal with a betrayal from within his closest circle. This could lead to a civil war - like situation within the North. Also, there could be a plotline where he tries to form an alliance with other regions not by force but by offering something unique, like a new form of trade or knowledge. Some fanfictions might also explore his journey to discover his true heritage, which could give him new powers or a different claim to the throne.
In some fanfictions, Tony Stark kills Thanos by outsmarting him in a battle of wits. He could set up a series of elaborate traps and illusions that deceive Thanos into a vulnerable position. For instance, he might create false Infinity Stones that Thanos is lured into trying to obtain, only to find they are booby - trapped. Then, while Thanos is distracted, Stark delivers the fatal blow. Or, Stark could use his Iron Man suits in a very creative way. He could send a swarm of mini - suits to attack Thanos from all directions, overwhelming him and finally finding a way to kill him.