Since I'm not familiar with a lot of 'null fairy fanfiction', it's hard to say for sure. But in general fairy - related fanfiction often has themes like magic, otherworldly powers, and a connection to nature. So perhaps in 'null fairy fanfiction' there could be some sort of unique take on these, or it might involve a 'null' concept which could mean a lack of something normal for fairies, like a lack of wings or a lack of magic in a particular context.
The idea of a 'null fairy' is quite interesting when thinking about themes. It could potentially have themes related to identity. The null fairy might be constantly trying to define itself in a world full of fairies with more traditional traits. Another theme could be transformation. Maybe the null fairy has the potential to change or adapt in ways that other fairies can't. And of course, there could be themes of mystery and the unknown, as the very concept of a 'null' fairy implies something not fully understood within the fairy realm.
One common theme is probably adventure. Ben is known for his adventures in the original series, and in fanfiction with the Null Fairy, they might go on new quests together. Another theme could be friendship or partnership. How Ben and the Null Fairy work together, support each other, and grow their relationship is often explored.
Well, without more context about what 'null fairy' means in the fanfiction world, it's difficult to give exact stories. However, you can check out some popular fanfiction communities where people might be creating unique concepts like this. Fanfiction.net could also be a place to explore. Just use the search function and type in 'null fairy' and see what pops up. Keep in mind that you may need to dig a bit deeper as it might not be mainstream.
I'm not sure of specific 'Ben 10 Null Fairy' fanfiction titles off the top of my head. But if you join some Ben 10 fan communities on social media platforms like Reddit or Facebook groups dedicated to Ben 10, you can ask the members there. They are usually very passionate and would be able to point you to some great fanfictions about the Null Fairy. They might even share their own works if they have written any related to it.
One common theme could be the search for identity. Since the fairy is lost, it might be on a journey to figure out who it really is. Another theme might be about friendship, as the lost fairy may encounter other characters who help it along the way.
One common theme is the exploration of Hermione's new identity as a fairy. This often includes how she adjusts to having different powers and abilities compared to her normal witch self.
One common theme is the combination of magic and adventure. Just like in the original 'The Hobbit', there are quests and challenges, but the addition of fairies brings in a new level of magic. For instance, the fairies might use their magic to aid the characters in their travels or battles.
Another theme is friendship. Stiles forms bonds with the fairies, and they learn to rely on each other, like in 'Fairy Allies' where Stiles and a group of fairies team up to save their land from destruction.
Another theme is the power struggle. Sometimes the earl has power in his own world, and the fairy has magic power. How they interact with each other's power and whether they cooperate or compete is often explored. For example, in some fanfictions, they might have to combine their powers to defeat a common enemy. Also, the theme of self - discovery is prevalent. Both the earl and the fairy might learn something new about themselves through their interactions with each other, like in the fanfiction 'The Earl's New Path with the Fairy', where the earl discovers a more empathetic side of himself thanks to his adventures with the fairy.
Power struggle is a very common theme. Fairies often fight to gain more power, whether it's magical power or political power within their fairy society.
One common theme is the clash of two different worlds. The fairy represents the magical, otherworldly realm while the earl is from a more mundane, human world. Their interaction often leads to interesting cultural and lifestyle differences being explored.