One common theme could be the exploration of Orochimaru's complex character in relation to the original character (OC). It might involve the OC being drawn into Orochimaru's world of dark magic and experiments. Another theme could be a relationship of power imbalance, where Orochimaru's power and influence play a major role in the story with the OC.
One common theme is power and ambition. Since Orochimaru is known for his pursuit of power, the OC often gets caught up in that. Another is the exploration of the dark side of the ninja world. Orochimaru is a rather dark character, so the OC may have to deal with moral gray areas. And there's also the theme of self - discovery. The OC in these fanfictions usually has to figure out who they are in relation to Orochimaru and the world around them.
Power - seeking is a common theme. The oc is often trained by Orochimaru to gain great power. Survival is another one. Given Orochimaru's dangerous and unpredictable nature, the oc has to constantly fight to survive the training. Also, self - discovery. Through the tough training, the oc discovers their own limits and capabilities.
Power and control are common themes. Orochimaru is always seeking power, and when paired with an OC, often there's a struggle for control in their relationship. The OC might resist Orochimaru's influence or be drawn to it in a complex way.
Well, since I haven't delved deep into orochimaru and sakura lemon fanfiction, it's hard to say for sure. However, possible themes could be redemption. Maybe Orochimaru has some kind of journey towards redemption in relation to Sakura. Another theme could be the clash of different values. Orochimaru has his own set of rather dark values compared to Sakura's more positive and growth - oriented ones. And there could also be a theme of unexpected alliances or relationships that develop between them in these fanfictions.
One common theme could be the exploration of Orochimaru's complex and often dark character in situations that deviate from the main canon. However, forced scenarios in fanfiction are not ethical in real - world terms and should be treated as fictional exploration. Another theme might be the power dynamics within the fan - created situations.
One common theme could be the power struggle. Orochimaru is a powerful and often cruel character. In a fanfiction with an OC (original character), the torture aspect might be used to show how the OC tries to resist Orochimaru's power. Another theme could be the exploration of dark magic or jutsu. Since Orochimaru is into such things, the OC might be tortured as part of his experiments with forbidden techniques. Also, there could be a theme of redemption. Maybe the OC manages to change Orochimaru in some way through their experiences of being tortured and interacting with him.
Power dynamics is a big theme. Orochimaru has a lot of power and knowledge, and he uses it to manipulate Sasuke. Sasuke, in turn, is trying to gain power from Orochimaru while not being completely controlled. Another common theme is the struggle between good and evil. Sasuke is on a very thin line between becoming a tool for Orochimaru's evil plans and finding his own path towards redemption or justice. Also, the theme of mentorship is there, as Orochimaru is in a sense Sasuke's mentor, but a very unorthodox and dangerous one.
One common theme could be adventure. Since 'the doctor' is often associated with traveling through time and space, the 'oc' can get involved in these exciting adventures. Another theme might be romance, as the relationship between the doctor and the oc is explored in different ways.
One common theme could be the power dynamic between the Joker and the OC. Since the Joker is such a complex and powerful character, exploring how an OC interacts with him in terms of power can be interesting.
Love and passion are very common themes. Since it's often about Damon, there's usually a strong sense of attraction and a complex relationship. For example, in many of these fanfictions, the OC might be initially hesitant about getting involved with Damon because of his reputation, but then they can't resist the pull towards each other.