Maybe the story could start with Serena finding out she's pregnant. Ash is initially nervous but super excited. As the baby is born, it has some unique abilities related to Pokémon communication. The family then embarks on a journey to find out more about this special gift. They meet different Pokémon experts along the way, and the baby forms a special bond with a rare Pokémon that helps protect the family during their travels.
One plot idea could be Serena and her partner facing challenges together during her pregnancy. Maybe they have to deal with family reactions that are a mix of excitement and concern. Another could be Serena exploring new hobbies or interests while pregnant as a way to prepare for motherhood.
One plot idea could be that in the fanfiction, Hermione discovers she's pregnant after a magical accident. Maybe she was working on a complex spell and it had an unexpected side effect on her body, leading to pregnancy. She then has to figure out how to balance her normal life, which might include her studies or her work in the wizarding world, with the new situation of impending motherhood.
One idea could be that baby Mario and baby Luigi get lost in a magical forest filled with strange creatures. They have to use their baby wits and little jumps to get through obstacles and find their way back home. Maybe they befriend a little fairy who guides them part of the way.
One idea could be that Baby Mario and Baby Peach go on a magical adventure through the Mushroom Kingdom, encountering new and strange creatures along the way. They might have to work together to solve puzzles to reach a special power - up that can save the kingdom from a new threat.
One plot idea could be that an ancient spell backfires on Inuyasha. Kagome has to take care of baby Inuyasha while also trying to find a way to reverse the spell. Maybe she has to search for a rare herb that only grows in a dangerous, demon - infested area.
One idea could be a story where the baby in the 'baby project' has some sort of special power that the characters have to figure out how to manage. Maybe the baby can communicate telepathically and it leads to all sorts of comical and heartwarming situations as the characters try to understand what the baby wants.
One plot idea could be that Baby 5 and Sai are on a mission together. They start off not getting along well because of their different personalities. Baby 5 is impulsive and Sai is more reserved. But as the mission progresses, they begin to understand each other's strengths and develop a mutual respect. They end up saving each other during a dangerous encounter and form a strong friendship.
One idea could be about the baby's first adventure in a magical garden. Maybe the baby discovers a hidden path and meets talking animals who teach it about the magic of nature.
One idea could be that the baby has a special power that tames the beast. For example, the baby's laughter might have a calming effect on the usually fierce beast.
Perhaps a story where the baby malachite is a special kind of malachite that is prophesied to bring great change to its realm. Some might want to protect it while others might see it as a threat. The baby malachite then has to deal with all these different attitudes towards it. It could also be about its relationship with a wise old mentor who teaches it about its heritage and the responsibilities that come with its powers.