It could also be a love story. The 4th and 10th could be individuals from different social strata or with different backgrounds. Their meeting could be like a spark that ignites a deep emotional connection. At first, they might face opposition from their respective 'worlds' because of their differences, but through their determination and the strength of their feelings, they strive to be together.
The '4th meets 10th fanfiction' might be a story where the 4th entity has a certain goal or mission and during that journey, they cross paths with the 10th. They could then team up to face a common threat or solve a mystery that neither could solve alone. For example, if they are from different magical realms, their combined powers could be the key to saving both realms from a dark force.
Perhaps it could be a story in a school setting where the 4th grade students meet the 12th grade students. There could be a lot of misunderstandings at first because of the age difference. But then they discover they have common interests, like a shared love for a particular sport or art form. They work together to overcome some school - related challenges, like saving a club from being shut down.
They could also meet in a time - locked situation. The 12th Doctor is trying to solve a mystery from his past, and the 13th Doctor stumbles upon the same situation in her present. At first, they don't understand how they are both involved, but as they start to piece things together, they discover that it's all part of a much larger, more sinister plot. Along the way, they might meet some old friends or foes from their respective tenures as the Doctor. And in the end, they work together to outwit the mastermind behind the plot, all while having some really interesting conversations about their experiences as the Doctor.
In the fanfiction, the 11th doctor, with his eccentric and energetic personality, could initially be a bit confused by the 13th doctor's more modern approach. But then they could start to combine their wits. For example, the 11th doctor's knowledge of ancient alien races could be paired with the 13th doctor's understanding of current galactic politics. They could work together to save a planet that is on the brink of destruction due to a complex web of time - related issues. The encounter could also lead to some humorous moments, like when they argue about who has the better sonic screwdriver or who has had the more exciting adventures.
One possible plot twist could be that they find out they are both parts of a larger plan by an unknown enemy. Maybe an ancient force has been manipulating their timelines to bring them together for some sinister purpose.
In fanfiction, when the 13th Doctor meets the 11th Doctor, there could be a lot of chaos and fun. They might exchange stories about their adventures. Maybe they would team up to fight a common enemy that spans across their different timelines.
In fanfiction, when the 11th Doctor meets the 12th Doctor, there could be a clash of personalities at first. The 11th is so full of child - like wonder and the 12th is a bit more reserved. But then they might find common ground in their love for the TARDIS and for saving the universe. They could end up learning from each other. For example, the 11th Doctor might teach the 12th how to be more carefree sometimes, while the 12th Doctor could show the 11th how to be more strategic in dangerous situations.
It's hard to say without more context, but they could be two characters who are ranked 4th and 10th in a particular system. For example, in a school of magic, the 4th best student in one class and the 10th best in another class meet.
Maybe the main characters are a group of rebels from the 4th and the ruling class from the 12th. The rebels are fighting for change, and the ruling class is trying to maintain the status quo. Their meetings and clashes can create a lot of drama and conflict in the fanfiction.
In a fanfic, when the 10th doctor clone meets the 11th, it could be a moment full of drama. The 10th doctor clone, having his own set of memories and experiences, might initially be a bit hostile towards the 11th. But as they start to interact more, they could discover that they have more in common than they thought. For example, their love for adventure and their sense of justice. They could also compare their different TARDIS interiors and time - traveling techniques. Eventually, they might even form an alliance to protect the universe from a greater threat that neither could handle alone.
In this fanfiction, perhaps Harry would introduce the Doctor to the wizarding world. The Doctor could then use his scientific knowledge to understand the magic there, and they might team up to fight some common enemies that threaten both the wizarding world and the universe at large. For example, there could be an alien race that wants to harness the power of magic for their own evil purposes. The Doctor's technology and Harry's magic would make for an interesting combination to combat such a threat.