There's also a chance that a new, original villain could be created for this fanfiction. It could be an alien race that has a grudge against the Doctor for something she did in the past (even if it was a past regeneration). And they target Amy and Rory to get to the Doctor. This new villain could have unique powers and a complex backstory that makes them a formidable foe.
In this fanfiction, it's possible that Amy and Rory will be quite shocked to meet the 13th Doctor at first. They'll soon realize that she has her own unique charm and way of doing things. They could end up helping her save the day, perhaps by using their past experiences to offer different perspectives on the problems they encounter.
It could be the Daleks. They are a classic Doctor Who villain. They might see the meeting of two Doctors as a threat to their plans for universal domination and try to stop it.
There are quite a few authors to look for. [Author Name 7] has been writing some amazing 11th Doctor and Rory fanfictions. Their stories are often character - driven, which means they focus a lot on the development of the Doctor and Rory's relationship. [Author Name 8] is another author who is great at world - building within the fanfiction. They create really interesting and believable settings for the Doctor and Rory to explore. And [Author Name 9] has a reputation for writing very humorous fanfictions that still manage to stay true to the characters of the 11th Doctor and Rory.
One popular storyline is Rory having to save the 11th Doctor from a particularly dangerous alien threat. Maybe the Doctor is trapped in a time - loop created by a malevolent race, and Rory uses his military training and knowledge of the Doctor's habits to break the loop. Another is when they end up in a parallel universe together and have to find their way back home while dealing with the strange and often hostile versions of people they know. And there are also stories where Rory and the Doctor get separated and have to rely on their bond to find each other again.
One great '11th doctor and amy fanfiction' is 'The Lost Journeys'. It beautifully captures the dynamic between them. Another good one could be 'Amy's Hidden Adventures' which delves deeper into Amy's character in relation to the 11th doctor.
The Daleks could be the main villain. They might be trying to manipulate the Doctor's regeneration to create chaos in the time - space continuum. Since the 9th Doctor's unexpected jump to the 11th Doctor disrupts the normal flow, the Daleks could take advantage of this instability to further their evil plans of universal domination.
Loss and sacrifice are common too. There are times when either the Doctor or Amy has to make sacrifices for the other or for the greater good. This adds depth to their relationship and makes for some really emotional and engaging fanfiction. Also, the idea of the Doctor being an alien and Amy being a human and how that affects their relationship is often explored.
A good fanfiction in this case would have well - developed characters. It should capture the essence of the 11th Doctor and Amy as we know them from the show. For example, the Doctor's quirky and somewhat alien nature, and Amy's strong - willed personality. The build - up to the kiss is crucial too. It shouldn't feel rushed but rather a natural progression of their relationship within the story.
Fanfiction.net is also a great place to find '11th doctor and amy fanfiction'. There are many dedicated writers who post their stories there. Just use the search function and type in '11th doctor and amy' to get a list of relevant stories. You might also find some on Tumblr, where fans sometimes share their own fanfiction or recommend others.
One common theme is the exploration of an alternate timeline. Since they don't originally meet in the show, fanfictions often play with the idea of what could have been if they did. It's about creating new adventures and relationships that didn't exist in the official story.