You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own. Just type in 'Jack Atlas x Carly Nagisa' in their search bars and you should get relevant results.
One popular theme is probably the development of their relationship. It could start from their initial interactions and gradually build up to a deeper emotional connection.
Sean confessed to Leah in the movie, and Leah also had a good impression of him. Although Sean had loved Carly before, he chose Rheia in the end. Therefore, it could be said that Sean loved Rheia more than Carly.
It could be an over - enthusiastic fan at an iCarly event. The fan might be so excited to meet Carly that they accidentally knock her down while rushing towards her.
One popular storyline is about Carly and Freddie finally getting together after years of being friends. They might face some challenges like dealing with their different career paths but end up realizing their love for each other. Another is a 'what if' scenario where they start dating during the original run of the show and how it would change the dynamics among the iCarly crew. There are also storylines where they go on adventures together, like traveling around the world and having romantic moments in different exotic locations.
First, you need to really understand the characters of Carly and Freddie. Watch a lot of iCarly episodes to get a feel for their personalities, likes, and dislikes. Then, come up with an interesting concept for your story. It could be a new adventure for them, or a different take on their relationship. Next, create an outline of your story, including the beginning, middle, and end. And don't forget to use your creativity to add some unique twists and turns. Also, make sure to write in a way that captures the essence of the iCarly world.
Obviously, her best friends Sam and Freddie would visit her. They are always there for each other. Maybe Gibby would also come over with his unique brand of humor to try and cheer Carly up.
I really liked 'Carly, Sam and the Mystery of the Old Mansion'. In this fanfiction, Carly and Sam find an old mansion and start to explore it. Along the way, they encounter strange things and have to rely on each other. It has a touch of mystery and adventure, which makes it a really engaging read.