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, a plot could revolve around Aku trying to keep his pregnancy a secret from Samurai Jack. He might be worried that Jack would use this new situation to his advantage. And then there could be a sub - plot about Aku having strange cravings that lead him to unexpected places in the world of the fanfiction, causing chaos in different ways.
It could be that Aku read stories to children as a way to exert control over their minds and influence their thoughts in his favor.
Aku could be a storyteller. Maybe it's a person's name.
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.
One common theme is the struggle between good and evil, as Jack represents good and Aku represents evil. Another is the concept of fate, as their battles seem pre - ordained.
One possible plot could be that Aku somehow ends up in the Naruto universe. Naruto, being a fan, is initially excited but then realizes that Aku's presence is causing chaos. So, Naruto has to find a way to either send Aku back or find a way to co - exist with Aku without letting Aku's evil influence overtake the ninja villages. He might try to reform Aku using his own positive attitude and the power of friendship, which is a common theme in Naruto.
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.
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.
Since Naruto has the Nine - Tails' chakra, which is a powerful and primal energy, and Aku has his own otherworldly and malevolent energy, they could combine these energies in a last - ditch effort to defeat an ultimate enemy. This combination could create a completely new form for Naruto, one that has the strength and ferocity of the Nine - Tails along with Aku's dark and mysterious powers. It would be a visually stunning and very powerful transformation that could turn the tide of a great battle.
There are also Aku and Jack fanfics that delve into the idea of redemption for Aku. In these stories, Jack may play a role in Aku's journey towards redemption. They might start to understand each other on a more personal level rather than just as nemeses. Some fanfics also introduce new characters that interact with Aku and Jack in interesting ways, adding more depth to the overall story.