One idea could be that Rose's pregnancy brings new challenges to her training at the Vampire Academy. Maybe she has to deal with physical limitations while still trying to prove herself. Another could be that her pregnancy causes a stir among the different vampire factions, some seeing it as a sign of hope and others as a threat.
One possible storyline could be that Rose has to deal with the reactions of her friends and family. Lissa might be initially shocked but then become very supportive. Dimitri, if he's still in the picture, could be overprotective. Another aspect could be how Rose manages her training while pregnant. Maybe she has to find new ways to stay in shape and keep her skills sharp for when the baby arrives.
In the Vampire Academy setting, Rose's pregnancy could be a huge shock to the system. The strict rules and hierarchies of the academy might not be prepared for such a situation. Her pregnancy could lead to new alliances being formed, like other dhampirs or vampires coming to her aid. Also, the medical facilities at the academy could play a role in her prenatal care, and there could be a whole sub - plot about the secrecy or lack thereof regarding her pregnancy within the academy walls.
A fanfiction could involve Rose being captured by Strigoi. She then has to use her wits and combat skills to escape. Along the way, she discovers some secrets about the Strigoi that could change the way the dhampirs and Moroi view them. For example, she might find out that some Strigoi were forced into their state against their will in some strange, dark ritual.
I really liked 'Lissa and Rose: The Unseen Adventures'. This fanfic takes the two on a journey outside of the normal Vampire Academy setting. They face new challenges together, which makes their friendship even stronger. The writing is quite engaging and it's easy to get lost in the story.
Love is a very common theme. Many fanfictions focus on the romantic relationships between the characters, like Rose and Dimitri. Their love story is often explored in different ways, sometimes with added drama or new challenges.
I really like 'A Rose and Adrian Adventure'. It takes them on a new quest outside of the typical Vampire Academy scenarios. It's full of action and also shows their romantic side. They face new enemies together and in the process, their relationship becomes even stronger.
There are many great fanfictions out there about Rose and Dimitri's kiss. One possibility is that the kiss could be a turning point in their relationship. It might be a moment of passion that has been building up over time, with all the tension between them finally exploding into that one kiss. In some fanfictions, this kiss could lead to them finally admitting their true feelings for each other and facing the challenges that come with their relationship, like the rules of the academy and the danger from the Strigoi.
There could be many fanfictions centered around Lisa Rose's haircut in Vampire Academy. Maybe in one, her new haircut is a symbol of her newfound independence. It could be that she cuts her hair short after a major event in the story, like breaking free from a controlling relationship or finding her true self.
One of the main themes is loyalty. In the fanfictions, Rose and Mason are often depicted as being extremely loyal to each other. They support each other through thick and thin, whether it's dealing with the politics of the vampire world or personal issues. Also, self - discovery is a theme. As they go through different situations in the fanfictions, they learn more about themselves, their powers, and their place in the world. For example, in some stories, Rose discovers new aspects of her dhampir abilities while Mason discovers more about his own strengths and weaknesses in relation to Rose.