Well, a frequent theme is the exploration of how Sherlock's relationships with his friends, like Watson, are affected by his new romantic relationship. In some fanfictions, Watson is supportive, while in others he is a bit skeptical at first. Also, the theme of secrecy often comes up. Sherlock may try to hide his relationship because he's not used to showing his emotions publicly or he may fear it will interfere with his detective work. And then there's the theme of the mystery surrounding the person he falls in love with. Usually, there's something unique or puzzling about this person that draws Sherlock in, much like a case would.
One common theme is the clash between Sherlock's logical mind and the illogical nature of love. His deductive skills are often at odds with his new - found emotions. Another theme is the transformation of Sherlock's character. He has to adapt to being vulnerable and having someone else in his life. For example, in many fanfictions, he starts to care about someone else's feelings more than just the facts of a case.
A common theme is family. Since they are siblings, fanfictions often explore their family bond, whether it's a strained relationship at first that gradually improves, or a strong bond from the start that they rely on during cases. For example, in some stories, Sherlock initially underestimates Enola but then realizes her value as a family member and detective.
The theme of adaptation is quite common too. Sherlock Holmes has to adapt to the strange new world of Naruto, with its different rules, powers, and social structures. At the same time, Naruto characters might have to adapt to Sherlock's rather un - ninja - like ways of doing things. And there's also the theme of uncovering secrets. Sherlock's nature of uncovering hidden truths fits well with the Naruto world which is full of secrets, be it about the origin of certain jutsus or the true motives of some characters.
The theme of justice is also very common. Both Sherlock Holmes and Batman are dedicated to bringing criminals to justice. In fanfiction, they often team up or compete in the pursuit of this goal. They might have different ideas about what justice means exactly, but they both strive to make their respective worlds a better place by stopping the bad guys.
Well, there's a fanfiction titled 'Sherlock's Unlikely Romance'. In this story, Sherlock meets a woman who challenges him intellectually and gradually he finds himself falling for her. It's interesting because it shows a different side of Sherlock that we don't often see in the original stories. Also, 'The Love Affair of Sherlock Holmes' is quite good. It delves deep into how Sherlock would handle the complex emotions of falling in love within the context of Victorian London society.
In many Sherlock Holmes love story fanfictions, the theme of redemption can be found. For example, if Holmes has a troubled past or has made mistakes in his relationships, his new love can be a path to redemption. Also, the theme of sacrifice is common. Holmes may have to sacrifice his time dedicated to solving crimes for his love, or vice versa. And of course, the theme of mutual understanding. His partner needs to understand his eccentricities, and he needs to understand her needs in a relationship which is often a central part of the story.
One common theme is mystery - solving. Just like in the original Sherlock Holmes stories, the fanfictions often have him using his deductive reasoning to solve magical mysteries in the Harry Potter world.
One common theme is mentorship. Often, Sherlock Holmes takes on the role of a mentor to the little girl, guiding her in the ways of deduction and mystery - solving.
One common theme is the unspoken love between them. In many fanfictions, Sherlock is portrayed as having deeper feelings for Molly that he struggles to express. For example, in some stories, he might show his care for her in small, indirect ways like solving a case that's related to her in some way.
Another theme is the mystery - solving aspect. Fanfictions usually have them working together to crack cases, with Holmes' brilliant mind and Watson's practical knowledge. In 'The Mystery of the Missing Heirloom' fanfiction, they use their combined skills to find the heirloom. Watson provides medical insights that help Holmes piece together the clues.
The theme of power dynamics is often explored. Sherlock is a very intelligent and dominant character, and the OC may either challenge that or submit to it. This creates tension and interesting plotlines. For example, an OC who is just as intelligent as Sherlock may constantly compete with him, leading to a battle of wits that is exciting to read.