Flynn in fanfic is often shown as intelligent. He uses his wits to get out of tricky situations. In a fanfic about a mystery in the castle, Flynn figures out the clues and solves the mystery before anyone else, showing his sharp mind.
The plot could involve Flynn Rider trying to reform the Stabbington Brothers. He might start by outsmarting them in a heist, but instead of turning them in, he offers them a chance to change their ways. They could initially be resistant, but over time, they start to see the benefits of Flynn's way of life.
Maybe Flynn Rider is on a quest for a rare jewel and it leads him to Arendelle. There, he encounters Elsa. Elsa is initially afraid she might accidentally harm Flynn with her powers. However, Flynn is intrigued by her powers and helps her see that they can be used for more than just isolation. They could team up to protect Arendelle from an approaching threat using Elsa's powers and Flynn's street - smart skills.
Flynn is confident and a bit of a rogue. He'd likely be drawn to Elsa's mystery and power. Elsa, on the other hand, is reserved and cautious. Flynn would probably try to break through her shell with his charm and humor. Their different personalities could create a lot of tension at first, but also a great deal of growth. For example, Flynn could teach Elsa to be more carefree, while Elsa could teach Flynn about responsibility.
One common theme is adventure. Flynn is often depicted going on new and exciting adventures. Another is love, especially his relationship with Rapunzel. And his past and how it shaped him is also a popular theme.
A fanfiction could explore a backstory where Flynn Rider and the Stabbington Brothers were once friends or at least allies. They could have had some sort of falling out over a big heist gone wrong. The story could then focus on how they might overcome their differences and work together again. For example, Flynn discovers that the Stabbington Brothers were set up in the previous heist and he decides to help them clear their names.
There are fan fictions where Flynn Rider gets transported to a different realm. In this new world, he has to use his charm and thieving skills in unexpected ways to survive and find a way back to his own world. It often involves him making new allies and facing new foes.
Sure. 'A New Adventure for Flynn' is a great one. It continues his story in a new, exciting way. There's also 'Flynn's Hidden Past' which delves deep into his backstory before he became the charming thief we know. Another interesting piece is 'Flynn and Rapunzel: After the Happily Ever After' which shows their life post - the movie events.