Well, the theme of forgiveness is quite common. Donald has to forgive Douglas for his past actions, and vice versa. And of course, the theme of science and innovation. They are both brilliant scientists, so fanfictions often involve them creating new inventions or solving complex scientific problems. Also, the theme of self - discovery is there. They both learn more about themselves through their experiences with each other in the fanfictions.
A common theme is redemption. Douglas has had his share of wrongdoings in the show. Fanfictions might explore how he tries to redeem himself in the eyes of Donald and others. It could also be about their family heritage and how it affects their present lives and decisions. For example, how their family's scientific legacy has shaped their individual career paths and goals in the fan - created stories.
One popular Lab Rats Donald and Douglas fanfiction is 'The Brothers' Reunion'. It focuses on their relationship after years of separation and how they navigate their differences. Another great one is 'Douglas' Redemption' which delves into Douglas' journey to make up for his past mistakes. There's also 'Donald and Douglas: A New Start' which shows them starting a new project together, rebuilding their bond.
I think the characters of Douglas and Donald are both well - written depending on the fanfiction. Some fanfic authors are really good at portraying Douglas as a conflicted character. He has his own desires and ambitions that sometimes conflict with what is right, and this internal struggle is well - depicted. Donald, on the other hand, is often shown as the more stable and moral compass in the relationship. His reactions to Douglas' actions can be really nuanced and add a lot to the story. In some fanfictions, side characters related to them, like their family members or lab assistants, can also be very well - written, adding depth to the overall story.
Leo can also be an excellent character to pair with Douglas. Leo, being the step - brother of the bionic trio, has a unique perspective. He can be both suspicious of Douglas's motives and also be the one to give him a chance at redemption. Their relationship can develop as Douglas tries to prove himself to Leo, and Leo learns to see the potential good in Douglas.
There could be a fanfiction where Douglas tries to create a new bionic technology that is a blend of his previous work and the Davenport's technology. This could lead to some interesting power struggles and also moments of cooperation as he has to work with the other characters to perfect it. He might also face some ethical dilemmas regarding the use of this new tech.
One common theme is redemption. Douglas has done some not - so - good things in the show, and a lot of fanfictions explore his journey towards redemption, often with Chase playing a role in it, either as an ally or a skeptic.
Chase is another popular character. His intelligence and his role as the 'brains' of the Lab Rats make him a great character for fanfiction. Stories could revolve around him coming up with new bionic enhancements or solving complex problems that the group faces.
In the 'lab rats chase and donald fanfiction', it could be that the lab rats are intelligent and they've been tasked with finding Donald for some special reason. It might be related to a new discovery in their lab. They chase him, and along the way, there could be all sorts of comical and exciting situations as Donald tries to escape from these persistent lab rats.