One good louise x logan fanfiction could be 'The Unexpected Bond'. It delves into how Louise and Logan meet in a rather strange situation and gradually form a unique connection. Another might be 'Louise's Discovery' which focuses on Louise realizing her feelings for Logan in the midst of some chaotic events in their town. And there's also 'Logan's Perspective' which is written from Logan's point of view as he falls for Louise.
To write a louise x logan fanfiction, start by getting to know the characters well. Read about them in the original source material. Then, decide on the theme of your story. It could be a love story, a friendship story, or something more adventurous. For example, if it's a love story, you can show how their feelings for each other start to grow. You can add some conflict, like family disapproval or a rival for one of their affections. As you write, make sure to keep their voices true to how they are in the original work. Also, don't be afraid to be creative with the plot and add your own unique twists.
Another place to look is FanFiction.net. It's been around for a long time and has a lot of user - generated content. Just use the search function and type in 'louise and logan' to see what comes up.
One great louise and logan fanfiction could be about their adventure in a mysterious forest. Maybe they discover a hidden treasure and have to work together to overcome obstacles in their path.
One idea could be a story where Logan helps Virgil and Roman understand each other better. Logan uses his logic to analyze their differences and find common ground for them. Maybe they are working on a project together in the mindscape and initially clash, but through Logan's mediation, they start to see the value in each other.
You can try some popular fanfiction websites like Archive of Our Own (AO3). There are often a lot of works related to different pairings, and it's likely to have some great louise and logan fanfic there.
I really like 'Logan's Unspoken Love'. In this fanfic, the author does an amazing job of showing Logan's tough exterior but soft heart when it comes to the reader. It's full of little details that make the relationship seem so real. 'The Journey with Logan' is also good. It follows the reader and Logan as they travel across the country, facing various obstacles along the way. And 'Logan's Promise' is a touching story where Logan makes a promise to the reader that he will always protect them.
A common theme is the 'opposites attract' idea. Since Louise is bold and Rudy is shy, their differences make for an interesting dynamic in many fanfictions.
One common theme is friendship. Gene and Louise might be shown as having a deepening friendship through various adventures. Another theme could be family - like relationships, where they support each other like siblings.