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.
One idea could be Big Chill Baby getting lost in an unknown dimension and having to find its way back home while making new friends along the way. Another could be Big Chill Baby learning a new power that no other of its kind has, which then attracts the attention of both allies and enemies.
One idea could be exploring the backstory of the 'big chill' character in more detail. Maybe how they came to be with their unique abilities.
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.
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.
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.
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 really interesting plot could involve a time - traveling aspect. Ben and Julie accidentally travel back in time to when Ben first got the Omnitrix. They have to be careful not to disrupt the timeline while also trying to find a way back to their own time. Along the way, they could meet younger versions of characters they know and have some really fun and emotional interactions. This could also lead to Ben learning some important lessons about his powers from his past self.
One idea could be exploring the backstories of the Big Chill Babies. Maybe they have unique powers that are yet to be fully discovered. Another could be a story about their first encounter with other alien species and how they interact.
One idea could be Ben getting stranded on an alien planet full of strange and dangerous creatures. He has to use his alien forms in creative ways to survive and find a way back home.
Maybe a story where Ben teams up with some of his alien enemies against a greater threat in space. They could be in a situation where they have to fight a powerful cosmic entity that wants to destroy all known planets. Ben would have to convince his former foes that they need to work together by showing them the magnitude of the danger.