In Buffy Xander fanfic, the theme of growth is quite common. Both characters grow as individuals and in their relationship with each other. For example, Xander might become more confident in his feelings for Buffy as the story progresses. Also, the theme of sacrifice. There are times when either Xander or Buffy has to sacrifice something for the other's well - being or for the greater good of the town. Additionally, the theme of hidden feelings is often there, with one or both of them hiding their true emotions from each other.
One common theme is friendship. Their long - standing friendship is often explored more deeply, like how they support each other through all the chaos in Sunnydale. Another theme is unrequited love. Sometimes Xander has feelings for Buffy that she may or may not return in the fanfic. And of course, the theme of fighting together against evil. They are part of the Scooby Gang and their teamwork in battling vampires and demons is always a part of these stories.
Since I don't promote or encourage lemon (explicit) content, I can't really say about the common themes in such fanfiction. But in general, in normal Xander and Buffy fanfiction, common themes include their friendship, their shared experiences in fighting vampires and other supernatural beings, and the growth of their relationship over time.
In Xander x Cordelia Buffy the Vampire Slayer fanfiction, the theme of redemption can be quite common. Cordelia, who may have been mean - spirited at first, can find redemption through her relationship with Xander. Social class differences are also a theme, as they come from different social strata in the Buffyverse. This creates tension and also opportunities for character development. And finally, the theme of loyalty is present. As they face the various threats in the Buffyverse, their loyalty to each other becomes a crucial part of their relationship and the story.
One common theme is the internal struggle of the character having the crush. They might be dealing with feelings of insecurity or fear of rejection in relation to Xander.
One common theme could be friendship. Maybe the story focuses on how Buddha and Xander become friends and the adventures they have together.
One common theme is redemption. Angel, being a vampire with a soul, often has a journey of redemption, and Xander can be a part of that journey in the fanfic. For example, Xander might be the one to push Angel further towards the good side.
Survival is also a big theme. Xander has to adapt to the harsh and unforgiving world of Westeros. He faces challenges like the cold, lack of food, and enemies at every turn. Another theme is loyalty. Xander has to decide who he can trust among the many devious characters in the Game of Thrones universe, and his choices regarding loyalty greatly impact the story.
Since I don't have specific knowledge about 'boypussy xander spike' fanfic, I can only guess. It might have themes related to the relationship between the two characters. Maybe themes of loyalty, or how they face challenges together. It could also potentially have themes of growth, as the characters develop throughout the story.
Another possible theme is the struggle between good and evil within the context of their relationship. Angelus has his dark side, and Xander represents the more normal human side, so their interactions can be a study of how these two elements interact.
One common theme is the struggle between Buffy's slayer duties and her new role as a mother - to - be. For example, in many fanfics, she has to figure out how to keep fighting evil while protecting her unborn child. Another theme is the reaction of her friends and family. They might be shocked, supportive, or even worried about how this will change Buffy and their group dynamic.
Another theme is the battle between good and evil within Spike. Given that he's a vampire, there's always that struggle, and Buffy's influence on his choices is a big part of many fanfics. For example, some fanfics might show how Spike's love for Buffy makes him question his vampiric nature and strive to be more 'human' in his actions.