Cera is also a favorite. Her strong - willed personality as a child is likely to be even more pronounced as she's grown, and her relationships with the other characters, especially any romantic interests, can be a big draw in fanfiction.
One interesting plot could be about the characters facing a new and mysterious threat in their now - grown - up world. Maybe a new type of predator that they have to figure out how to deal with using their adult skills.
Tommy is often a popular choice. Since he was kind of the leader in the Rugrats days, it's interesting to see how he grows up and takes on more responsibilities as an adult. His relationships with the other characters can also be explored in different ways.
Littlefoot is often very popular. He's the main character in the original series, so in TF fanfiction, his transformations usually drive the plot forward. Cera is also popular as her stubborn nature can be changed in interesting ways through transformation. And Petrie, with his ability to fly, can have really unique TFs that add to the adventure, making him a fan favorite in the TF fanfiction world as well.
One common theme is the struggle for survival. As they grow up, the characters still have to face threats from nature, like food shortages or harsh weather. Another theme is friendship. Their bonds, which were formed when they were young, continue to be important as they face new challenges together.
One plot idea is that Chomper discovers a new power or ability as he grows up. Maybe it's a special roar that can calm other dinosaurs or a way to sense danger from far away. This new ability attracts the attention of both good and bad dinosaurs. Some want to use him for their own gain, while his friends try to protect him. Chomper has to decide how to use this power and who to trust as he comes of age in the land before time.
There is a fanfiction that focuses on the relationships between the grown - up characters. It delves into how their friendships have evolved over time and how they support each other in different situations. For example, Littlefoot and Cera might have different leadership roles as adults and this fanfiction could show how they work together.
The characters who are seen as the most dynamic in the original work also tend to be popular. This could be the character who has the most growth or change throughout the story. Maybe it's the character who starts off as a bit of a slacker but then finds a new purpose in life.
Definitely Deku. His growth from a timid boy to a powerful hero makes it exciting to imagine his further development as an adult. Bakugo is also a popular choice. His fiery personality and his complex relationship with Deku offer a lot of potential for interesting grown - up storylines.
I think Littlefoot from 'Land Before Time' and Hiccup from 'HTTYD' would be a great pair. Littlefoot is a brave and curious dinosaur, and Hiccup is an intelligent and kind - hearted Viking. They could share their knowledge of their respective worlds. For instance, Littlefoot could teach Hiccup about the different types of plants and animals in the pre - historic world, and Hiccup could show Littlefoot how to build things like the Vikings do.
It often depends on the original source material. If it's based on a kids' show, then the main characters would be the grown - up versions of those from the show.