The plot is important too. Maybe it could be an adventure where they work together to save the day in Adventure Bay. Or a story about how they discover their feelings for each other. A good plot keeps the readers interested from start to finish.
One common theme is friendship. Their bond as members of the Paw Patrol is often explored and strengthened in fanfictions. For example, stories where they help each other out during difficult missions.
One possible storyline could be that Marshall and Everest go on a special rescue mission together in a very dangerous place like a frozen cave. They have to rely on each other's skills. Marshall's fire - fighting skills might come in handy when there are ice - related hazards that could cause fires, and Everest's climbing and snow - traversing abilities help them reach the trapped animal or person. Another could be a story where they get lost in a blizzard during a routine patrol. They have to find their way back to the Lookout while also taking care of each other, sharing their food and warmth. This would strengthen their bond and show their friendship.
You can try looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. There are often communities dedicated to Paw Patrol fanfics where you might find some great Marshall x Everest stories.
Marshall can be developed by exploring his fear of getting stuck in the snow. Maybe in the fanfic, he has an incident where he almost gets buried in a snowdrift. This makes him face his fear and with Everest's help, he overcomes it. Everest, on the other hand, can be developed in terms of her patience. Since Marshall might be a bit clumsy in the snow at first, she has to be patient with him, and through this, she becomes more understanding and empathetic.
Friendship is a very common theme. Their bond as pups in Adventure Bay is often explored, like how they support each other during difficult times.
A really interesting fanfiction idea could be that Marshall accidentally discovers Everest's secret hiding place where she goes to be alone and think. Everest is initially upset but then realizes that Marshall was just worried about her. This leads to a series of adventures where they explore the area around Everest's hiding place and discover new things about the Paw Patrol's world.
There's a great fanfiction called 'Marshall and Everest: A Love Story'. It explores the idea of them having more than just a friendship. In this story, they support each other through tough times and gradually realize their feelings for one another. It has some really sweet moments.
The key elements could be their first encounter. It might be a moment that was special and made them notice each other. Another key element could be shared values. If they both value honesty and loyalty, it would strengthen their relationship.
The fanfic about Marshall Lee x Gumball is appealing because it gives fans a chance to see their favorite characters in new situations. Fans love to see how these two very different characters would react to things like a magical mystery or a dangerous adventure together. It also gives room for exploring different emotions. Maybe Marshall Lee is initially cold to Gumball but then warms up over time, and this kind of emotional journey is really engaging for readers.
I'm not sure which specific 'Marshall and Everest' you are referring to. If they are characters from a particular show or book, more context would be needed. But generally, a love story between them might involve them meeting by chance, gradually getting to know each other's personalities, and then falling in love. For example, they could have shared interests that brought them together, like a love for adventure or a common goal.