The unique plot. It likely has a story that stands out from others, perhaps with an unusual take on characters or a different kind of world - building.
Well, 'Overlord' might be a good choice. It has a powerful main character in a different kind of world setting. And also, 'Sword Art Online' has elements that might appeal to those who like 'aku no musume light novel' like its exploration of different worlds and character development.
I'm not sure specifically as there could be many novels by 'mothy'. It might be a new creation with unique characters, a new plotline, perhaps in a genre like fantasy or mystery.
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, mothy light novel is known for its engaging dialogue. The conversations between characters feel natural and help to move the story forward. It also has a way of creating suspense and mystery. The way the plot unfolds keeps readers guessing, which makes it really interesting to read.
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.