A 'ben big chill fanfic' could be about various things. It might focus on adventures that Ben Tennyson has while being able to transform into Big Chill. Maybe it details battles he fights in that form, or it could be more about the relationships he forms with other characters while in the guise of Big Chill.
Well, it could be about the adventures of the Big Chill babies in the Ben 10 universe. Maybe it focuses on their growth, powers, or how they interact with other characters.
Obviously, the Big Chill babies would be the main characters. There might also be some other characters from the Ben 10 universe like Gwen or Grandpa Max who could play supporting roles.
The fanfic might revolve around the Big Chill babies being in a situation where they need to protect something precious. It could be an ancient artifact that has the power to either save or destroy their part of the universe. They have to use their cold - based powers, like shooting ice blasts or creating ice shields, to fend off villains who want to use the artifact for evil purposes. Along the way, they might meet some of Ben's other alien forms and team up with them to achieve their goal.
One potential character could be a rogue alien scientist who is interested in Big Chill's biology. Another could be a young alien apprentice who looks up to Big Chill. And a third could be an ancient alien guardian who has knowledge about Big Chill's species' history.
One idea could be Big Chill getting trapped in an alternate dimension and having to find a way back home while facing unique enemies there. Another could be Big Chill teaming up with a new alien species that he initially doesn't trust. And a third idea could be Big Chill losing his powers temporarily and having to rely on his wits and the help of Ben's other alien forms.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms have a wide range of fan - created works, and there's a good chance you'll find some interesting 'ben big chill fanfic' there.
A fanfiction could explore a scenario where Big Chill gets injured during a battle and Swampfire has to take care of him. In the process of healing, they start to understand each other's vulnerabilities better. Swampfire's ability to create warm environments helps Big Chill recover, and this shared experience deepens their bond.
A great plot point could be the discovery of the pregnancy. It could be an accidental find during a routine check - up by some advanced alien technology. This could set off a chain of events where Big Chill has to quickly adapt to the new situation.