The story could have a forbidden love aspect, where the dragon's kind is at war with the human's and they have to fight for their relationship. Or perhaps the dragon has a curse that only true love can break.
Maybe it could be about a human falling in love with a dragon and having to overcome the differences in their species and the objections of others.
It could involve forbidden love, political obstacles, and epic adventures to prove the king's love.
One possible plotline could be that a young girl, who is an outcast in her town, somehow catches Slenderman's 'attention'. He begins to watch over her in his usual spooky way, but instead of harming her, he starts to develop feelings. As she becomes aware of his presence, she's initially terrified but gradually comes to understand his 'affections' and a strange relationship forms.
Perhaps the dragon in Jon's fanfiction is the last of its kind, and Jon has to protect it from those who want to harm it. There could be a whole story of them hiding, fighting off hunters, and trying to find a new place for the dragon to live safely.
Well, it might involve star-crossed lovers from different planets facing all kinds of space obstacles and cultural differences to be together.
It could involve the rover's adventures on a distant planet, facing various challenges and discoveries.
The unicorn might go on a magical adventure to save a kingdom or help a lost child find their way home.
It could involve space exploration, discovering new planets, or encountering alien civilizations.
Perhaps the Jester and the Dragon don't get along at first in the fanfiction. This could create a lot of interesting situations. Jane would then have to play the mediator and in the process, they all learn to work together better. There could be some humorous exchanges between the Jester and the Dragon as they slowly become friends.
One possible plotline could be that Harry discovers he has the ability to communicate with dragon serpents. This newfound skill helps him in his fight against Voldemort. Maybe the dragon serpents know of a hidden weakness of Voldemort's that no one else does.
Perhaps in the fanfic, Naruto turns into a dragon as a result of a forbidden jutsu gone wrong. In his dragon form, he discovers a connection to an ancient dragon spirit that guides him. This spirit could teach him new abilities and knowledge. His friends, like Sasuke and Sakura, would then have to help him figure out how to reverse the transformation or at least learn to live with it. They could go on a journey to find a way to control the dragon within Naruto, facing various challenges along the way, such as other ninja clans who see Naruto's new form as a threat.