Love against all odds is a big theme. In the wizarding world, their relationship might be seen as inappropriate or difficult. But in these fanfictions, they overcome those obstacles. Also, self - discovery is there. Snape and Harry both learn more about themselves through their relationship in many of these stories. And of course, the theme of forgiveness plays a role as they have had a rather rocky past in the original story.
The theme of transformation is quite common. Snape, who is often seen as a cold and harsh character in the original books, undergoes a transformation when in a relationship with Harry in the fanfictions. His softer side is revealed, especially in the context of being the bottom in the relationship. There's also the theme of breaking taboos, as the Snarry relationship goes against the norms of the wizarding society.
One popular 'bottom Snape Snarry' fanfiction is 'The Bond' which delves deep into the complex relationship between Snape and Harry. It has great character development and an engaging plot.
Since I don't really advocate or promote this specific type of fanfiction due to its non - traditional nature, it's hard to say the common themes. But generally in fanfictions about characters, there could be themes of love, sacrifice, and self - discovery. However, in the case of 'bottom snape mpreg', it may also involve exploring non - canonical relationships and situations in the Harry Potter universe.
Another trope is the internal struggle within Snape. His jealousy battles with his self - imposed sense of propriety. He has been Harry's teacher and has a certain image to uphold, but his jealousy makes him act in ways that are out of character for that image. This creates a lot of tension in the story.
One common theme is the exploration of the power dynamic between Snape and Harry. Given Snape's position as a teacher and Harry's as a student, there's a lot to unpack there.
The theme of redemption can be quite common. Snape, being a morally ambiguous character, may seek redemption through his relationship with Harry in these vampire - themed stories. Also, the exploration of the vampire's nature, like their immortality and the way it impacts their connection with a mortal like Harry, is often seen.
The exploration of alternate timelines is a significant theme as well. In many snarry time travel fics, the characters end up in timelines that are different from what they know. This allows for creative storytelling as they have to adapt to new situations and relationships in these altered timelines.
One common theme is redemption. Severus often has a lot to atone for in the eyes of Harry, and through the hurt - comfort dynamic, he gets a chance at redemption. For example, in many fics, Severus might have made mistakes in the past, but as Harry helps him when he's hurt, Severus can start to make amends.
Overcoming prejudice is another theme. Snape has a rather complex and not - so - positive reputation in the original series, and Harry is a well - known figure. Their relationship goes against the norm, so they have to defend their love against the prejudice of others, including their friends and colleagues.
The character development of Snape is crucial. He has to evolve from being a seemingly bitter and resentful teacher to a self - sacrificing protector. Also, the fanfiction often plays with the idea of redemption for Snape through his protection of Harry. The power dynamics between them, with Snape being the more experienced wizard and Harry having his own special powers, is another key aspect.
There's 'A Protector's Duty'. In this fanfiction, Snape's protection of Harry is rooted in his deep - seated sense of honor and his unspoken feelings for the boy. It's full of intense moments where Snape has to make difficult choices to shield Harry from various threats within the wizarding world.