To start a 'lab rats little brother fanfiction', you should do some research on the original show if possible. This will help you get a better understanding of the world and the characters. Then, make a list of things you want to include in your story, such as new inventions, character growth for the little brother, or a new villain. Once you have these elements, start with a hook, like the little brother receiving a strange message that leads him on an adventure. From there, you can start building the story, introducing characters and settings as you go.
First, choose the other show or story you want to crossover with. Then, research both the Lab Rats universe and the other one thoroughly. Decide on how the characters will meet. It could be a freak accident, a planned event, or something else. Next, outline the basic plot. Are they going to be friends or foes at first? What is the main conflict they will face? Start writing the first scene, usually the meeting of the characters from different universes. Keep in mind the personalities of all the characters involved.
First, you need to be familiar with the 'Lab Rats' world, its characters, and the basic plotlines. Then, think about how the diaper element can fit into this world in a logical way, even if it's a bit out - there. For example, you could start with a situation like a malfunction in the bionic technology that causes a character to need diapers temporarily.
To start writing a 'lab rats crossover fanfic', begin by choosing a concept for the crossover. It could be something like a crossover with a magical world. Once you've chosen, think about how the 'lab rats' characters would react to this new and different world. Write down some character sketches for the 'lab rats' in this new context. For instance, how would Chase's intelligence be used in a world full of magic? Then, outline the story. Decide on the main conflict, whether it's between the two groups at first or a common external enemy. Start writing the first few paragraphs, setting the scene and introducing the crossover premise. You can also look at other successful crossovers for inspiration.
Perhaps a story where the little brother gets transported back in time to when the lab rats were first created. He could be the one to influence some of the early decisions made in the lab, like suggesting a different design for their living quarters or a new way to approach their training. This would change the course of their development and create a whole new set of adventures for both him and the lab rats.
To write your 'lab rats x reader stories', you also need to consider the conflict. It could be internal, like the reader's struggle with their fear of rats at first. Or it could be external, such as the lab facing a funding cut and the rats being in danger of being sent away. Develop this conflict throughout the story and show how the reader and the rats overcome it together.
First, you need to really understand the source material that the 'little brother' comes from. Know his character traits, his relationships, and the world he exists in. Then, come up with an interesting idea for a story. It could be something as simple as a day in his life that goes unexpectedly or a big adventure he embarks on.
Another plot could be a more comical one. Your little brother accidentally gets mixed up with the lab rats' experiments. He starts to gain some of their powers in a really chaotic and funny way. For example, he gets the bionic super - speed but can't control it at first and keeps running into things all over the house and school. The lab rats then have to figure out how to reverse the effects while also trying to keep his new powers a secret from everyone else.
Some social media groups dedicated to Lab Rats might also be a good place to look. People often share their fanfictions in such groups. For example, on Facebook groups related to the show, fans might post their creative works about the Lab Rats and your little brother concept.
First, know the characters well. Understand Adam's brash but kind - hearted nature and Chase's more intellectual and cautious side. Then, come up with an interesting plot. It could be something like a mystery in the lab that only they can solve together. Don't forget to add some good dialogue that shows their unique personalities and the bond between them.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms have a large collection of fan - created works, including 'lab rats 2012' crossover fanfiction. Just use the search function on the site and type in 'lab rats 2012 crossover' and you should be able to find relevant stories.