Definitely fiction. Dexter is a fictional character and the storylines are made up to engage and thrill the audience. The events and scenarios presented are not based on real-life occurrences.
In this story, Dexter might be a character who is on an 'ego trip'. He could be someone who is ambitious, perhaps overly so. He might be constantly seeking validation, power, or recognition. His actions throughout the story could be a reflection of his egotistical nature. For instance, he may strive for success in his career or personal life not for the intrinsic value but to boost his own self - image and satisfy his ego. His character development could also be centered around learning to control or reevaluate his ego as the story progresses.
One common theme is family loyalty. Despite Dexter's secrets, Debra often shows loyalty to him as her brother. Another theme is secrecy. Dexter has to keep his true self hidden from Debra, which creates a lot of tension in the fanfiction.
Some Dexter fanfiction stories that are well - liked include those that give Dexter a more heroic role. For example, 'Dexter: The Avenger' where he uses his skills not just for his own needs but to protect the innocent in a more direct way. Then there are stories that change the timeline, like 'Dexter: Rewritten Beginnings' which might start his story from a different point and lead to a whole new set of adventures and character developments.
Some fanfictions might focus on alternative universes where their relationship takes a different turn. For example, what if Debra was more accepting of Dexter's 'hobby' from the start? Or what if Dexter was more open with Debra? These 'what - if' scenarios can lead to very different storylines. There could also be themes related to protecting each other, especially when outside forces threaten their relationship or their lives, as they are both in a rather dangerous world in the Dexter universe.
A really engaging Dexter x Doakes fanfiction is 'The Bond That Wasn't'. It imagines a world where Dexter and Doakes form an unspoken bond before the events of the show. The author does a great job of showing their initial animosity slowly turning into something more complex. There's also 'In Doakes' Shadow' which focuses on how Dexter views Doakes from a different perspective, adding new layers to their relationship.
It's popular because it combines two very interesting characters. Blossom is strong - willed, intelligent, and has superpowers. Dexter is a brilliant boy genius. Putting them together creates a lot of potential for unique storylines. They can have adventures, solve problems, and develop a relationship that fans find exciting to read about.
Probably 'Dexter by Design' is also among the popular ones. It has a great plot that involves Dexter's interactions with other complex characters and some really exciting and unexpected events.