Another trope is the 'protective Rex' trope. Rex is often depicted as being very protective of Ahsoka, whether it's from physical danger or from the emotional turmoil she might face. This can lead to some really sweet and heart - warming scenes in the fanfics.
A common plot in 'ahsoka x rex fanfic' is the trust - building plot. Given their different positions in the Star Wars world, they need to build or re - build trust in some stories. For example, if Rex has been affected by some sort of mind - control, Ahsoka has to help him regain his true self and in the process, they strengthen their bond. There are also plots where they protect a group of innocents together, showing their heroic sides.
Ahsoka and Rex have a very interesting dynamic in fanfics. In many of these stories, their friendship from the Clone Wars is often explored more deeply. It might involve them going on adventures together outside of the main storyline of the series. Their relationship is complex, with Rex being a clone and Ahsoka being a Jedi, and fanfics can play around with how they interact with each other in different situations.
You can try some popular fanfiction websites like Archive of Our Own (AO3). There are often a large number of well - written fanfics about Captain Rex and Ahsoka there. Just search for their names in the search bar and you'll get a list of relevant stories.
Another theme is the 'what - if' scenarios. For example, what if Rex had been with Ahsoka during certain key events that she faced alone in the official story? It adds an interesting twist to the narrative. And some fanfics also focus on their relationship post - Clone Wars, how they might reunite and what that would be like considering all the changes that have occurred.
The 'enemies - to - lovers' trope could be interesting. Maybe they start off on the wrong foot, with some misunderstandings between them. But as they work together more, they see the good in each other and eventually kiss. Another trope could be the 'forbidden love' one. Given their different positions and the rules in their world, their relationship might be frowned upon, which makes their kiss all the more passionate and risky.
Good 'rex x ahsoka fanfic' often has a deep exploration of their characters. It shows Rex's loyalty and military discipline, and Ahsoka's Jedi skills and her growth. For example, in some fics, Rex helps Ahsoka understand the clone soldiers better, and Ahsoka in turn teaches Rex about the Force in a more practical way.
The 'fish out of water' trope can also be seen, like when Lux is in a situation more familiar to Ahsoka as a Jedi, or vice versa. It creates interesting situations for character development. There's also the 'redemption' trope where one of them might be in a situation where they need to be redeemed in the eyes of the other.
One popular trope is 'Ahsoka as a Mentor'. In many fanfics, she takes on the role of guiding a young, inexperienced character. It's a great way to show her growth and wisdom.
There's also 'Rex and Ahsoka: A Different Path'. This fanfic takes a unique approach by imagining what would happen if they had to go on a secret mission together away from the main events of the war. It delves deep into their characters and how they support each other in difficult situations.
One great 'rex and ahsoka fanfic' is 'The Bond Beyond Battles'. It beautifully explores their relationship as comrades and friends. The story shows how they support each other during tough times in the Clone Wars.