Adventure is also common. They could be on a quest to find a lost item or to explore a new part of their world. It makes for exciting reading as they face various challenges as babies. For instance, they might encounter a small stream that they need to cross but are too small to do so easily. And they have to figure out a solution together. This kind of adventure - based theme is quite popular.
A really fun 'baby daisy and baby luigi fanfiction' could be set in a world of toys. They are toys themselves and they have to work together to escape from the clutches of an evil toy collector. They make friends with other toys along the way and use their unique skills, like baby Daisy's ability to find hidden paths and baby Luigi's courage, to overcome the challenges.
Peach could be an important character. As a friend of Daisy and a princess in the Mushroom Kingdom, she could offer her wisdom on raising a child. Also, Yoshi could be there. Yoshi is always friendly and could be like a protector for the baby, watching over it when Luigi and Daisy are busy.
You can start by focusing on their innocent personalities. For example, show baby Luigi sharing his favorite toy with baby Daisy. This simple act can create a warm feeling in the story.
One popular 'baby Luigi and baby Daisy fanfiction' could be those that focus on their adventures in the Mushroom Kingdom as babies. For example, there might be stories where they discover new power - ups together in a cute and innocent way.
Well, perhaps the plot could involve Daisy and Luigi facing the challenges of new parenthood. They might struggle to balance their own lives and duties while taking care of the baby. For example, Luigi could be worried about protecting the baby from the various threats in their world, while Daisy is focused on the baby's growth and development.
One possible plot could be that Luigi and Daisy discover they are going to have a baby. They then start preparing their home, like painting a nursery. Luigi might be a bit nervous but also excited, and Daisy could be the strong one, reassuring Luigi throughout the process.
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.
Mario would definitely be a main character. Since Luigi is his brother, he would be the one most concerned about Luigi's transformation and would do everything he could to help him. Princess Peach could also be a main character. She might offer her castle as a safe place for baby Luigi and use her resources to find a solution. Toad could be there too, helping Mario with taking care of Luigi and providing useful information about the kingdom that could lead to reversing the spell.