What are some interesting plot ideas for 'brothers conflict new little sister fanfiction'?

One idea could be an OC who is a talented artist. She could use her art to bond with the brothers in different ways. For example, she might paint portraits of them, which could lead to some sweet and funny interactions as they react to how she's depicted them.

You can give her a distinct personality trait, like being extremely shy. This would make her interactions with the outgoing brothers more interesting as they try to draw her out of her shell.

Well, a plot could be about a special event, like a family vacation in the fanfic. During this vacation, the main character has some unexpected and heart - warming interactions with the brothers. Maybe there's a competition among the brothers to win the main character's attention in a friendly and humorous way. It could also show how they all grow and learn more about each other during this time.

One idea could be that the OC is a new neighbor who moves in near the family. Natsume initially seems cold to her, but as time passes, he starts to notice her kind heart and unique hobbies. They bond over shared love for books and late - night stargazing.

Maybe in the fanfiction, Hikaru and Ema are paired up for a school project. Hikaru is initially laid - back about it, but Ema's determination makes him more serious. Along the way, they have disagreements about how to approach the project, but gradually they learn to compromise and in the process, their feelings for each other begin to change.

One idea could be the little sister getting involved in a mystery at school. Maybe she discovers a secret club and has to figure out what they're up to. Another could be her starting a new hobby like painting and the twins being really supportive but also a bit overprotective. Or she could have a talent for music and enter a local competition, with the twins helping her practice.

Maybe the little sister gets lost in the backyard which has been magically transformed by one of their inventions into a huge, mysterious maze. Phineas and Ferb then have to use their wits and knowledge of the backyard to find her. It could show their protective side towards their little sister.

One idea could be that Harry's little sister discovers she has a unique magical power that no one else in the family has. Maybe she can communicate with magical creatures in a way that even Hagrid is impressed by.

One idea could be the little sister joining One Direction on tour. She could have her own mini - adventures at each stop, like trying local foods and making new friends. Another could be that she has a secret talent for songwriting and helps the boys come up with new hit songs.

The little sister could start a club at school that is inspired by the things the brothers do. But she faces some challenges like getting enough members and dealing with a strict teacher. The brothers might try to interfere in their own clumsy way to help her out. It could also be interesting if she has a secret friendship with one of the brothers' rivals and has to keep it a secret from her family.