One major challenge would be political. There would be many lords in the North who might not accept her rule easily. They could be traditionalists who think a woman shouldn't be in charge. Arya would have to prove herself through her actions and leadership skills.
One possible story could be Arya using her assassin skills to protect the North. She might face threats from the South or from within her own territory. For example, there could be lords who don't want to be ruled by a young woman. But Arya, being Arya, would use her wits and combat abilities to outmaneuver them.
One interesting Queen of the North fanfiction could be one where she unites all the northern houses against a new, unexpected threat from beyond the Wall. This could involve her using her diplomatic skills and the loyalty of her people.
In the 'Battle of the North' in the 'Game of Thrones' fanfic, it often showcases the epic struggle for survival and power in the North. The North is a harsh and unforgiving place, and battles there are filled with brutal combat. Different factions fight for control, resources, and honor. It's a great setting for intense character development as characters face extreme challenges and moral dilemmas.
In some more creative fanfictions, an outsider, like a mysterious traveler from the Free Cities, could be her love interest. He could bring new ideas and perspectives to the North, and their relationship could be a way to bridge the gap between the North and the rest of the world.
One key event could be the initial clash of the armies. This is where the chaos and bloodshed begin. Another might be the moment when a key leader falls, which can change the momentum of the battle. And perhaps the discovery of a hidden weapon or tactic that gives one side an advantage.
She can try fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfics from various fandoms, so there's a good chance she'll find Jon fanfic there.
She can try searching on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms usually have a wide range of fanfictions for various fandoms, so there's a good chance of finding Robb fanfic there.
There are various 'Games of Thrones fanfic' that delve into the backstories of minor characters. For example, a fanfic could center around the life of Podrick Payne before he became Tyrion's squire. It could show his upbringing and how he came to be in King's Landing. Also, some fanfics create new relationships between characters, like a friendship between Sansa and Brienne that blossoms in a unique way.
A good fanfic about Queen Melisandre should stay true to her character. Her mysterious and somewhat menacing nature should be maintained. For instance, if she's in a situation where she's making a decision, it should be in line with what we know of her from the series, like her unwavering belief in the Lord of Light.