They could get lost in an old, abandoned part of the railway. Thomas might be a bit scared at first, but Percy stays calm. Together, they explore the area, find old railway artifacts, and then figure out a way to get back to their normal tracks. It would be a story of discovery and courage.
A plot could be that a new engine arrives and is a bit of a bully to the smaller engines like Thomas and Percy. Thomas and Percy then team up to show the new engine the importance of kindness and respect. They could do this by being extra helpful to the other engines and inviting the new engine to join them in positive activities, like helping to build a new station for the local village.
Perhaps there's a mystery on the island where some of the toys at the station keep disappearing. Thomas and Percy decide to solve the mystery. They follow clues, like strange tracks on the ground and small bits of fabric left behind. Eventually, they find out that it's a group of mischievous mice who were taking the toys to build a cozy nest. Thomas and Percy then make a deal with the mice to share some old, unwanted toys, and they all become friends.
Perhaps there could be a story where Thomas and Edward compete in a friendly race. Along the way, they both learn important lessons about sportsmanship and friendship. For example, when one of them has a minor accident, the other stops to help, realizing that winning isn't everything.
One great fanfiction could be about Thomas and Percy's adventure in a new part of the island. Maybe they discover a hidden track that leads to a magical place full of talking animals and beautiful scenery. They have to work together to get back home and tell the other engines all about it.
One idea could be an OC engine that comes from a far - off land and has unique abilities, like being able to run on solar power in addition to steam. This engine could face challenges in adapting to the Sodor railway's rules and ways of working.
One plot idea could be that James and Edward get into a friendly competition to see who can pull the most cars in a day. Another could be that they have to work together to rescue a stranded train during a storm. Maybe there's a situation where James gets in trouble for being too boastful and Edward has to help him learn a lesson about humility.
One possible story could be that Percy gets into trouble and Gina comes to his rescue. For example, Percy might get stuck on a broken track, and Gina, with her quick thinking and strength, helps him out. It could show their friendship and how they support each other in difficult situations.
Perhaps there's a story where Thomas and Emily have to team up to win a race against some new engines that come to the island. During the preparation for the race, they discover new things about each other and their own capabilities. Emily might learn some of Thomas's quick - thinking strategies, and Thomas might learn from Emily's determination.
There could be a fanfiction where Thomas goes on an adventure outside of Sodor. He meets new engines in different lands, learns about their cultures and ways of working, and brings back new ideas to Sodor. For example, he might discover a more efficient way of shunting that he shares with Percy and the others.
One plot idea could be Ian Thomas faking his death and secretly coming back to help the Liars solve a new mystery that is related to his past. Maybe he has some secret knowledge that can protect them from a new threat in Rosewood.
Perhaps there's a magical event that only Thomas and the lady human can solve together. They might have to use their combined skills and knowledge. Thomas could use his physical abilities like speed or strength, while the lady human could use her intelligence or some special power she has to defeat an evil force that threatens their world.
One idea could be exploring how Thomas and Brenda prepare for the baby. Maybe they have to deal with unexpected challenges like finding a safe place to live in their post - apocalyptic world. Another plot could be centered around their fears and hopes for the future of their child.