One idea could be exploring the Night Stalker's backstory in more depth. Maybe he had a tragic childhood that led him to his dark deeds.
One plot idea could be that Tootles discovers a lost White Night Fury egg. He decides to take care of it and as the dragon hatches, they form an unbreakable bond. Together, they go on adventures in a magical forest, facing various mythical creatures and helping other animals in need.
A detective who is obsessed with catching the Night Stalker. He could be a grizzled veteran with a troubled past of his own.
One common theme is the struggle between good and evil. Since the night stalker is often depicted as a dark and menacing figure, many fan fictions explore whether it can overcome its dark nature.
Perhaps the stalker is a new character who has a misguided admiration for Spider - Man. They think that by stalking Peter, they can get closer to the superhero lifestyle. They might leave little gifts or notes for Peter, which at first seem harmless but gradually become more and more intrusive, making Peter feel very uncomfortable and on edge.
Well, you could write a Stalker fanfiction where the stalker has some sort of supernatural ability. For example, they can become invisible at will. This would add an extra layer of mystery and danger to the story. Also, the relationship between the stalker and the victim could be more complex, like the stalker actually believes they are protecting the victim in a twisted 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.
Well, you could have a survivor fan fiction where a contestant has a hidden skill, like being able to communicate with animals on the island. This could give them an edge in finding food and avoiding danger. Or perhaps a story where there's a traitor within the group, someone who is secretly working with the show's producers to create more drama. Also, a plot where the survivors find a map that leads to a hidden part of the island with a bountiful supply of food and shelter.
One idea could be that the Ghostbusters discover a new type of ghost that can possess technology. So they have to find a way to stop it from taking over all the electronics in the city. It would be a race against time as the city starts to descend into chaos with machines going haywire.