I'm not sure who Aku specifically is. Aku could be a person with a great imagination who tells all kinds of stories, like adventure stories, fairy tales or even true - life stories.
It could be someone from the Naruto universe who doesn't like Naruto's newfound fascination with Aku. For example, Danzo might see Naruto's interest in Aku as a threat to the stability of the village and try to stop Naruto from further exploring Aku - related things. So, Danzo could be the main antagonist in this case.
The character of Aku could be developed in a 'pregnant Aku in Samurai Jack fanfiction' by exploring how he interacts with the world around him differently. He may become more reclusive as he doesn't want others to see his 'weak' state. Or he could become more aggressive in trying to protect his pregnancy, which would be a new aspect of his character. Also, his relationship with his own power might change. Maybe he has to find new ways to use his magic that don't harm the unborn, which would force him to grow and adapt in ways he hasn't before.
Well, not knowing the exact details, it might have a complex love story. Maybe there are characters who face various challenges in their relationships, as is often the case in many novels.
One idea could be a crossover where Aku accidentally opens a portal to the Naruto universe. Naruto, being the curious and brave ninja he is, decides to explore Aku's world. They could start off as enemies, but gradually come to understand each other's motives and end up teaming up against a greater evil that threatens both of their worlds.
Rasa crossover fanfiction is a type of fan - made story that combines elements from different 'rasa' related works. It often takes characters, settings, or concepts from various rasa - based stories and merges them in creative ways. For example, it could bring together characters from different rasa - inspired video games or novels and put them in new and unexpected situations. This can lead to really interesting and unique storylines that appeal to fans who are familiar with the different rasa elements being combined.
Well, without having read the 'Jaya and Rasa A Love Story', it's difficult to be precise. However, it's likely that the story follows the journey of Jaya and Rasa's love. It may include their initial attraction, the development of their feelings, and the trials and tribulations they endure. For example, they could encounter misunderstandings that threaten to break them apart, but then through communication and mutual understanding, they strengthen their bond and continue their love story.
A common theme is power combination. Since Naruto has his own set of powerful ninja techniques and if Rasa has unique powers too, the fanfiction often shows how these powers can be combined or contrasted. For example, Naruto's Rasengan and a special power from Rasa could be used together in battle.