Another plotline could be that during the birth, Katniss has flashbacks of her time in the Hunger Games. These memories fuel her determination to create a better world for her child. The baby's arrival also causes a shift in the political situation, as the districts see the new life as a sign that they need to work even harder to ensure a safe and prosperous future for all children.
One possible plotline could be Haymitch helping Katniss deal with the aftermath of the Hunger Games. He could use his own experiences to guide her and they could develop a deeper bond. For example, he might teach her how to handle the political side of things in the Capitol, which she is not very good at initially.
One possible plotline could be about the challenges she faces in a post - Hunger Games world. Maybe there are still political unrests and she has to deal with that while being pregnant. Another could be her relationship with her parents during this time. Katniss and Peeta might be overprotective or she could be trying to prove her independence from them.
Gale could be another important character. Despite his complicated relationship with Katniss, he still cares about her. He might be on the lookout for any external dangers while the birth is taking place. His skills as a hunter and his knowledge of the land could be used to protect Katniss and her new - born baby.
Perhaps the fanfiction could focus on the relationship between Orochimaru and Baby Mitsuki as a father - son type of bond. Orochimaru, having created Mitsuki, might have some paternal feelings. The story could show how Orochimaru tries to raise Mitsuki in his own way, teaching him about the ninja world, and how Mitsuki grows up with a unique perspective due to his creator. For example, Mitsuki might question Orochimaru's more devious actions while still having loyalty towards him.
A plot could be that their baby has some special abilities. Maybe it has an uncanny ability to sense danger, which is both a blessing and a curse. Peeta and Katniss have to figure out how to help their child control this ability while also keeping it a secret from those who might want to use the baby for their own gain. It could lead to a series of adventures as they move to different districts to keep the baby safe.
The fanfiction might depict the baby as a symbol of hope for a new beginning. Katniss and Peeta could be seen trying to create a better world for their child. They would have to deal with the public eye being on them and their family. There could be heartwarming moments of them as a family, like family picnics in the meadow where they first fell in love, while also having to fend off any potential dangers to their baby.
Another plot could revolve around the baby inheriting unique powers. It might be a combination of Ichigo's Shinigami and Hollow powers and Orihime's abilities. This could attract unwanted attention from various factions in the Bleach world, leading to a story of the family trying to keep the baby's powers a secret while also helping the baby learn to control them.
One possible plotline could be that the villains see potential in baby Izuku's quirkless state. They might think they can mold him into a powerful weapon against heroes. They could raise him with a warped sense of justice, teaching him that the heroes are the real villains. For example, they might show him instances where heroes failed to save people or were corrupt, gradually turning his view of the hero society upside down.
Another plot could be a love - triangle type situation where there is a third character involved. This third character has feelings for either Circus Baby or Ballora, which causes tension between the two. However, instead of fighting over the third character, they decide to work together to figure out if this third character has any ulterior motives. Through this, they grow closer and their friendship deepens.
Maybe something like Willow. It gives a sense of grace and strength, which would be fitting for the child of Finnick and Katniss.