There could be many fanfiction ideas involving the Loud family, Lincoln, and Rita. For example, a story could focus on Lincoln's adventures with his family members, and Rita could play a supporting role as a loving mother. Maybe Lincoln discovers a hidden talent of one of his siblings and with Rita's encouragement, they all work together to make it shine.
His siblings could be responsible. They are always getting into crazy situations together, and maybe one of their pranks or games goes too far and accidentally hurts Lincoln.
One popular 'Lincoln Loud is a girl' fanfiction might be the one where she navigates through the challenges of being a girl in a large family. In this story, she could face different expectations from her siblings compared to when she was a boy in the original series. It could show her trying on new clothes, getting involved in different activities that are more typical for girls in the show's universe, and having new kinds of relationships with her sisters.
A great Lincoln Loud fanfiction could involve Lincoln time - traveling. He goes back in time to when his parents first met and tries to make sure they still end up together, all while trying not to change too much of the past and accidentally erase his own existence.
One interesting 'The Loud House Lincoln' fanfiction could be about Lincoln going on a wild adventure in an alternate dimension. Maybe he discovers a new power or meets strange new characters.
One great Lincoln Loud fanfic is 'The Adventures of Lincoln'. It has an interesting plot where Lincoln goes on a journey to find a lost family heirloom. Another good one could be 'Lincoln's New Friends' which focuses on Lincoln making new friends outside of his usual circle. And 'Lincoln's Dream' is also a popular one, where Lincoln has these amazing dreams that start to affect his real - life adventures.
Maybe it's a new villain in Royal Woods. This person could be jealous of Lincoln's leadership skills within his friend group. So, they kidnap him to try and undermine his confidence and make his friends turn against him. They believe that without Lincoln, the group will fall apart and they can take over as the new 'leader' in the neighborhood.
A possible plot could be that Lincoln is kidnapped by a mysterious figure who has a vendetta against the Loud family. The kidnapper takes Lincoln to a remote location. Lincoln, being the brave character he is, tries to figure out the kidnapper's motives while also looking for an opportunity to escape. Meanwhile, his sisters and parents are following every lead they can find, from Lincoln's friends to any strange activity in town. The fanfiction could build up the tension as Lincoln tries to outwit the kidnapper and his family races against time to find him.
There might also be some original characters created specifically for the fanfiction. These could be other humans who know about Lincoln's secret or other supernatural beings that are related to the vampire lore in the story.
One idea could be a story where Lincoln and Lola have to team up for a school project. At first, they bicker as usual because of their differences. But as they work together, they start to understand each other better. For example, Lincoln realizes that Lola is not just a pageant - obsessed girl, and Lola sees that Lincoln has his own insecurities and strengths.