Perhaps a plot where Baby Melody gets lost, and Ariel has to search for her all over the ocean. Along the way, Ariel meets different friends and foes, and through her determination, she finally finds Melody. It could show the strong bond between them.
The main characters are, of course, Ariel and Baby Melody. Ariel is a mermaid known for her curiosity about the human world. Baby Melody is Ariel's daughter, who has her own charm and inquisitiveness.
A third plot could be a time - travel scenario. Ariel and Ursula are sent back in time to before Ursula made her evil choices. Ariel tries to prevent Ursula from going down the wrong path, and they end up changing the future of the underwater world for the better.
Another plot could be centered around a baby mermaid getting lost. The other mermaid babies then embark on an adventure to find their friend, encountering various challenges along the way like dangerous currents and unfriendly sea monsters. This could also be a chance for them to learn about teamwork and friendship.
One idea could be that Ariel and Eric are taking their baby on a magical underwater tour to introduce it to all of Ariel's friends in Atlantica. Another could be the baby showing signs of having both human and mermaid/merman powers and Ariel and Eric trying to figure out how to help the baby control them. Maybe there's a plot where an old enemy of Ariel's resurfaces and they have to protect their baby from this threat.
A possible fanfiction is that they time - travel back to an important historical event. Blake and Baby Ariel have to use their modern - day knowledge and skills to navigate through the past and accidentally change history in a positive way.
One possible plot could be Baby and Deborah going on a cross - country adventure, with Baby's amazing driving skills coming in handy during various unexpected situations, like escaping from some bad guys who are after them for some mysterious reason.
A possible plot in baby Rosalina fanfiction is that she befriends a lonely comet. The comet is usually shunned by the other celestial bodies because it's different. But baby Rosalina sees the beauty in it and they become friends. This story could teach about acceptance and friendship. And there could also be a plot where baby Rosalina has a dream of visiting a far - off galaxy and she tries to make that dream come true throughout the story.
One interesting plot could be Superboy discovers a baby with superpowers. He then has to protect the baby from villains who want to use the baby's powers for evil. Another could be that the baby is from another dimension and Superboy has to figure out how to send it back home while also keeping it safe in his world. Maybe the baby has a special connection to Superboy's origin that he has to uncover.
There are also plots where baby Stiles has some special powers that he doesn't have as an older character. The pack has to protect him from those who would want to use his powers for evil, and in the process, there are cute and heart - warming interactions between Stiles and the members of the pack as they try to understand his powers and keep him safe.
Perhaps in the 'bella as a baby fanfiction', there's a plot where Bella is a baby and she has a special connection to a magical or supernatural element in the world. For example, she can see fairies or spirits that others can't. This would create a lot of mystery and adventure as those around her try to protect her or figure out what she's seeing.