The Battle of Dong Mountain was an important event in the novel " Celebrating Years," which happened between chapters 125 and 155. This battle involved the Qing Emperor, Ku He, Sigu Jian, and the other four Grandmasters, as well as other aces. The Qing Emperor used himself as bait to attract the two Great Grandmasters of Northern Qi and Dongyi, Ku He and Sigu Jian. The Qing Emperor joined forces with Ye Liuyun and finally heavily injured Ku He and Sigu Jian. The Qing Emperor became the biggest winner. This battle laid an important foundation for the development of the subsequent plot. As for whether the second season of the TV series would involve the Battle of Dong Mountain, there was no clear news yet. According to the search results, if the TV series was to be filmed completely according to the original plot, the second season might not involve this plot. However, if the TV series needed some changes or cuts, the Battle of Dong Mountain might appear in a certain plot in the second season.
In the novel " Celebrating Years," the battle of Dong Mountain referred to the fierce battle between Fan Xian, Uncle Wu Zhu, the Shadow, Haitang Duoduo, Zhan Doudou, Lang Tiao, Ye Liuyun, Ku He, Xiao En, Hong Sixiang, and other aces at the top of Dong Mountain in Dongyi.
In this battle, Ku He and Xiao En were killed by Uncle Wu Zhu, Hong Sixiang was killed by Fan Xian, Lang Tiao, the Shadow, and Haitang Duoduo were injured by Fan Xian's Barrett, and Ye Liuyun was moved by Fan Xian's words and joined Fan Xian's camp.
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.
Honestly, I don't have the exact number of chapters for Stories of Legend Battle Cats off the top of my head. You might need to check the official source or a reliable fan community for the most accurate information.
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.
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.
In the novel "The Lich King", the Battle of Mount Hyjal was introduced, and Prince Arthas also appeared in it. He betrayed his family due to corruption and led the Scourge to invade the Kingdom of Lordaeron. He plotted to usurp the throne and become the Lich King. If you want to read the detailed plot of the novel, you can read the novel "The Lich King" to gain a deeper understanding. I hope my recommendation can help you. Muah ~