Often, it's the portrayal of Sherlock's softer emotions. For example, when he shows kindness or protectiveness towards someone, like in fanfics where he takes care of a child or an animal. That's really cute.
The special thing about Anderson Sherlock fanfic is that it can explore the relationship between Anderson and Sherlock in more depth. Anderson has a somewhat antagonistic relationship with Sherlock in the original, but in fanfics, this can be developed in various ways, like Anderson learning from Sherlock or vice versa. It also allows for creativity in exploring Anderson's own character arc which might be overshadowed in the main series.
Often, the theme of change is present in 'birthday boy sherlock fanfic'. His birthday could be a turning point in his life, either in terms of his relationships or his approach to solving cases. For instance, he might realize the importance of human connection more deeply on his birthday and start to change his aloof behavior.
One key element is the clash of their personalities. Sherlock is highly logical and methodical, while Lupin is more of a charming trickster. Their different ways of approaching problems make for interesting interactions. Another element is the mystery aspect. Usually, they are involved in solving some complex cases together. And of course, their relationship development, whether it's from being rivals to allies or something more complex.
One great 'Sherlock x Lupin' fanfic is 'The Meeting of Minds'. It beautifully weaves the deductive skills of Sherlock with the cunning nature of Lupin. Another interesting one could be 'Sherlock and Lupin: Unlikely Allies' which shows their unique relationship development. There's also 'In the Shadows of Baker Street' where their adventures together are quite thrilling.
Well, Sherlock himself is always a main character, whether he's depicted as a cat, dog or some other animal. Another common main character could be Dr. Watson, often reimagined as an animal too. For example, if Sherlock is a wolf, Watson might be a deer, acting as Sherlock's sidekick and chronicler of his adventures.
There could be a fanfic where Sherlock is a dog with extraordinary deductive abilities. In this story, he teams up with a group of other animals, like a wise old owl and a fast - running rabbit. Together, they solve the mystery of the strange noises in the forest at night. The dog Sherlock follows scents and analyzes clues, leading the group to discover that it was just a lost bear cub looking for its mother.
One really cute Sherlock fanfic is 'A Study in Pink Ribbons'. It shows a softer side of Sherlock as he tries to solve a mystery related to a little girl's lost pink ribbons. It has some really heart - warming moments between Sherlock and the little girl.