I'm not entirely sure what specific analysis you're looking for. But generally, in a 'cheaper by the dozen 2 charlie oc fanfic', it might explore the character of Charlie in new and different situations compared to the movie. It could focus on his relationships, his growth, or his role within the family dynamic.
One possible theme could be family. Since it's related to 'Cheaper by the Dozen 2', the family aspect is likely to be important. Charlie's experiences within his large family and how an OC might interact with the family could be explored. Another theme could be friendship. Charlie might form new friendships with OCs, and the story could show the development and challenges of those friendships.
The OC could be a new student at the kids' school and end up befriending the Baker kids. They then get involved in the family's day - to - day life. For instance, they might help the family when they decide to volunteer for a community project. This would involve working together, facing challenges as a group, and the OC bringing in their own unique skills and perspective to the situation.
The OC might interact with the younger Baker children by reading them bedtime stories or teaching them new games. For the older Baker kids, they could collaborate on school projects or join a local club together. In family gatherings, the OC could be the one who brings a new energy, like starting a new family tradition of having a talent show every month.
Family bonds are a very common theme. Just like in the original story, fanfics often focus on how the large family sticks together through thick and thin. For example, they might face financial difficulties or problems at school, but they support each other.