One common theme is adventure. Given Ahsoka's nature and the potential of the Oc Droid X, they might embark on various quests together. Another theme could be friendship or even a mentor - mentee relationship, where Ahsoka helps the Oc Droid X to understand things better, like the ways of the Force or the galaxy at large.
You can try platforms like Archive of Our Own (AO3). It has a vast collection of fanfictions. Just search for 'Oc Droid X Ahsoka' in the search bar, and you'll get a list of relevant stories. Another option could be FanFiction.net, although the interface and tagging system might be a bit different, but still has some great works in this area.
Another theme is the exploration of the Force. Since Ahsoka is a strong Force - user, fanfictions often use the OC to explore different aspects of the Force. Maybe the OC has an unusual connection to the Force or discovers a new way to use it, and Ahsoka helps them understand and develop this ability.
Many 'ahsoka x reader fanfiction' have the theme of discovery. The reader discovers new aspects of the Star Wars world, new powers, or new secrets along with Ahsoka. There is also the theme of trust. Given the dangerous situations they get into, the reader and Ahsoka have to learn to trust each other completely, and this is often a central part of the story.
Redemption is also a theme. Since Barriss made some controversial choices, some fanfictions might have Ahsoka helping Barriss find her way back, either morally or in terms of her place in the Star Wars universe.
One common theme is loyalty. Their loyalty to each other, whether as master - apprentice or as friends, is often explored. Another is growth. How they both grow as individuals through their relationship with each other.
One common theme is adventure. Given their roles in the Star Wars universe, many fanfictions will have them going on exciting quests together, facing off against the Empire or other threats.
The theme of growth is also prevalent. Anakin, Padme, and Ahsoka all grow as individuals through their interactions with each other. For example, Anakin may learn more about self - control from Padme and Ahsoka. In addition, the theme of family - like relationships often appears. They act like a family, supporting and caring for one another.
One common theme is mentorship. Since Obi - wan is an experienced Jedi and Ahsoka is a younger, up - and - coming one, there's often a focus on him guiding her. Another theme is friendship. They are both part of the Jedi Order, and stories might explore their bond outside of the typical master - apprentice relationship.
The theme of family also shows up a lot. Since they have a very close bond, it's like a family connection. Some fanfictions explore how they are there for each other like family members, through thick and thin.
One common theme is redemption. Even though Anakin has turned dark, there's often a glimmer of hope for him to return to the light through his connection with Ahsoka. Another theme is the struggle between loyalty and the dark side. Ahsoka has to decide how to deal with a dark Anakin, whether to try and save him or oppose him.