One idea could be that Sam meets another hermit in the mountains who has a completely different way of living off the land. They could exchange knowledge and Sam might learn new survival skills.
What if a group of lost hikers stumble upon Sam's part of the mountain? Sam has to decide whether to help them or keep his solitary life a secret. If he helps them, he could teach them about the mountain and its resources, but he also risks having his location discovered by more people which could disrupt his peaceful life.
One idea could be to have the main character discover a hidden cave filled with ancient Native American artifacts. This would add a new layer of mystery and adventure to the story.
A really cool plot idea could be that the fan fiction delves into the psychological aspects of the characters in a more extreme way. Like, how they cope with the high - stress situations in a different manner than what is shown in the official game. This could include exploring their fears, dreams, and how they interact with each other on a more emotional level, which in turn could create a very different and engaging story.
Maybe in this fan fiction, there could be a new alliance formed between the remaining Targaryens and the wildlings. They might join forces to take on the Lannisters and claim the Iron Throne. This would be an interesting combination as they have very different cultures and motives.
A great plot for My Hero Academia fan fiction is exploring the backstories of the teachers. What if Aizawa had a secret mission during his early hero days that changed his view on heroics? Another idea is to create an alternate universe where quirks are reversed. So, someone like Bakugo who has an explosive quirk now has a quirk that absorbs explosions. Also, you could write a story about a new student with a really strange and powerful quirk that no one understands, and they struggle to fit in while also being a target for villains.
An old mountain man who has been living in a different part of the mountain for decades. He could be a bit of a mystery at first, with his own set of rules and traditions. Sam could meet him during one of his explorations and they could share stories of their experiences in the wilderness. The old man could also teach Sam some ancient survival techniques that have been passed down through generations.
One idea could be that the character embarks on a journey through different dimensions to find a way to save his family. Another could be a time - travel plot where he goes back in time to prevent a great tragedy from happening to his friends. Maybe he discovers a hidden power within himself during a battle against a new, powerful enemy.
One idea could be to create an alternate universe where the hero's powers are reversed. For example, if the hero can usually fly, in this AU they might be afraid of heights. Another idea is to write a story about the hero's origin from a different perspective, like that of a bystander who witnessed the events that led to them becoming a hero. You could also explore a relationship between the hero and a minor character in the original story, developing it in a new and unexpected way.
One idea could be a story where the Mandalorian has to team up with an old enemy to fight a new, greater threat. Maybe a powerful Sith Lord emerges and they have to put aside their differences.
One idea could be exploring a different origin for Toothless. Maybe he was part of an ancient dragon tribe that was thought to be extinct. Another could be a story where Hiccup discovers a new dragon species that has unique abilities and forms an alliance with them. A third idea is a time - travel fan fiction where Hiccup goes back in time to prevent a great dragon war from ever starting.
A great plot for Warframe fan fiction could be a Tenno getting trapped in a parallel dimension where the rules of the Origin System are all messed up. They have to find a way back while dealing with strange versions of familiar enemies. Or perhaps a story about a Tenno who discovers a hidden Orokin vault that contains not only powerful weapons but also a secret that could change the balance of power in the Origin System. Also, a plot about a Tenno's struggle to control a newly acquired and extremely powerful Warframe that has a mind of its own could be really engaging.