One common theme could be family. The idea of Rex and Ahsoka starting a family and raising a baby brings in elements of love, protection, and new beginnings. Another theme might be the challenges they face, like how their Jedi and Clone Trooper backgrounds might affect their parenting.
Well, often the theme of hope is present. The baby can symbolize a new hope for the future, especially in the context of the Star Wars universe which has a lot of turmoil. There may also be themes related to identity. The baby would have a unique identity being the child of Rex and Ahsoka, and the fanfiction might explore how that identity develops in a world full of different species and cultures. Additionally, themes of loyalty and sacrifice could be explored as Rex and Ahsoka would likely be very protective of their child.
One common theme is the exploration of their different backgrounds. Rex is a clone and Ahsoka is a Togruta. Their upbringing and the roles they've played in the galaxy can create a lot of interesting stories within the context of their marriage.
One common theme is their friendship. Writers often explore how their bond grew during the Clone Wars. For example, fanfics might show how they supported each other in battles.
One common theme is loyalty. Rex and Ahsoka have a deep loyalty to each other that dates back to the Clone Wars. In many fanfictions, this loyalty is tested but always prevails. For example, in stories where they are faced with difficult choices that could put the other in danger.
I'm not sure of specific 'rex and ahsoka baby fanfiction' titles off - hand. But you can try searching on fanfiction websites like Archive of Our Own. There are often many talented writers who come up with interesting stories about different Star Wars characters and their relationships, including ones that might involve this concept.
One common theme is her early training. Writers often explore how she started learning the ways of the Jedi as a baby or a youngling.
One common theme is the struggle of parenthood. Given Anakin's fall to the dark side and Ahsoka's own journey of self - discovery, their child would face unique challenges. Another theme could be the child's power. Since both Anakin and Ahsoka are powerful Force - users, their offspring might have extraordinary abilities. And also, the theme of protecting the child from the dangers of the Star Wars universe, like the Sith or other threats.
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.
There are many positive alternatives. Fanfiction about their training sessions, how they learn from each other's skills and experiences. Or stories that explore their friendship deeper, like how they might have conversations during long space travels.
Such fanfiction is not suitable. Star Wars, where Rex and Ahsoka are from, is a franchise that has a broad and diverse fan base. Creating or promoting sexual fanfiction about its characters disrespects the original intention of the story and can make many fans uncomfortable.
There's also 'Rex and Ahsoka: Partners in the Shadows'. This one focuses on their covert operations. The author does an amazing job of showing their synergy and how they work together in secret missions. It has a lot of action and also some great character development for both Rex and Ahsoka.