There's also a fanfic called 'Bree's Redemption of Marcus'. In this one, Bree tries to reform Marcus after he gets into some trouble. It delves deep into their characters and how they interact with each other. The author does a great job of showing Bree's determination and Marcus' internal struggle.
The popularity of Lab Rats Bree and Marcus fanfiction might be due to the interesting dynamic between them. They are two very different characters, Bree being a good - hearted bionic hero and Marcus being more of an antagonist. This contrast makes for great storytelling potential.
There might be a fanfiction where Bree tries to redeem Marcus. Since Marcus has had a dark past, Bree could use her positive influence to turn him around. This could involve many adventures together where Bree shows Marcus the value of friendship and doing good. For example, they might have to rescue hostages held by a common enemy. Through these experiences, Marcus begins to question his old ways and slowly changes for the better.
Obviously, Bree herself is very popular. Writers often focus on her growth and her relationships with other characters like her brothers. Chase is also a popular character in fanfiction. His intelligence and his sometimes - clumsy attempts at normal teenage life make for great story material.
One idea could be a story where Chase and Bree have a small, intimate wedding on the island where they grew up. Their friends and family gather, and there are some humorous moments during the ceremony, like Adam accidentally setting off a small explosion as part of his 'unique' way of celebrating.
Well, a big theme is family. Given her situation in the lab and with her 'creators', family dynamics play a role. Sometimes it's about finding a true family among her friends. Also, the theme of power and responsibility. Bree has these great powers, and fanfictions often deal with how she uses them for good or struggles with the responsibility that comes with them. There's also the theme of adventure. She often goes on exciting adventures in the fanfictions, exploring new places and facing new challenges.
To write a good fanfiction, you need to understand the characters well. For Bree, remember her super speed and her kind heart. Marcus is more complex, with his villainous past. You could start with a simple idea, like them having to compete in a training exercise. As you write, let their personalities shine through. Add some conflict, like Marcus being tempted to use underhanded tactics but Bree stopping him. And don't forget to have a satisfying resolution at the end.
One interesting Bree Lab Rats fanfiction could be about Bree exploring new powers outside of what was shown in the show. Maybe she discovers a hidden ability that helps her save the day in a different way than usual.
The theme of sacrifice can also be seen in some of these fanfictions. Maybe Bree's death was a sacrifice for something greater, and the other characters are left to grapple with that. And sometimes there's a theme of a new beginning emerging from the ashes of her death, as the characters start to rebuild and redefine themselves.
Growth and self - discovery also feature often. As they face challenges together, both Bree and Ethan often grow as characters. They learn more about their own strengths and weaknesses and how to better support each other. This can be seen in fanfictions where they are put in difficult emotional or physical situations.