One idea could be exploring the backstories of minor characters in more depth. For example, the lives of the pilots who don't get as much screen time. Another could be a what - if scenario where a different character discovers the Cylons' plan earlier. And a third could be a story about a new colony that is formed during the journey through space.
There are many possibilities. For instance, a fanfiction that focuses on the cultural exchange between different human colonies within the fleet. How they adapt to each other's traditions and beliefs. Or you could write a time - travel story where a character goes back in time to try and prevent the Cylon attack. Another interesting plot could be a story centered around a character who has a special ability that no one else in the fleet has, and how that ability affects the overall situation.
One idea could be the Stargate teams finding a derelict Battlestar and trying to figure out its technology. They might encounter some of the Cylon technology which could pose a new threat or a source of new knowledge for them.
A possible fanfiction plot could involve a character from Battlestar Galactica having some latent magical ability. This person discovers the world of Harry Potter through a strange portal or something. They then have to learn how to use their magic while also trying to bring some of the magical solutions back to help their own people in the fight against the Cylons. And perhaps there could be a conflict between the magic - using wizards and the technology - reliant Galactica crew at first, but then they learn to work together.
One interesting storyline could be a self - insert character who has unique knowledge about the Cylons' weaknesses and uses it to help the Galactica crew. For example, they might know a way to disrupt the Cylons' communication network that was never discovered in the original series.
One interesting concept is the idea of changing key events in the original Battlestar Galactica storyline. For example, a character might travel back in time to prevent a certain battle from happening, which could have huge ramifications for the future of the human race in that fictional universe. Another concept could be characters from different time periods within the Battlestar Galactica world interacting in unexpected ways. It could lead to new alliances or rivalries that were not part of the original narrative.
One interesting crossover could be the use of Destiny's weaponry in the Battlestar Galactica universe. For example, Guardians from Destiny could bring their advanced energy guns to help the crew of the Galactica in their fight against the Cylons. This would change the power dynamics in the BSG battles.
Some interesting concepts would be related to the cultures. The Spartan culture in Halo with its focus on combat and loyalty could interact in an exciting way with the more democratic and diverse culture of the colonies in Battlestar Galactica. Then there's the idea of the Halo's Forerunners' technology falling into the hands of the characters in Battlestar Galactica. It could change the power dynamics completely. Also, the Cylons' ability to infiltrate and the Covenant's religious fanaticism could create some really complex and engaging storylines when combined.
One interesting concept could be the different alien cultures and their hierarchies. For example, some fanfics might explore an alien species where females are the dominant gender in their society, which is a contrast to the human culture in Battlestar Galactica. Another concept could be the unique technologies of the aliens. Maybe they have a way of traveling through space that is far more advanced than the humans', like being able to open portals instead of using traditional FTL drives.
The secrets of the Battlestar Galactica shipyards in fanfiction can be quite diverse. It could be that the shipyards are actually a front for something else entirely. Maybe they are secretly researching ways to communicate with other civilizations that are not supposed to be known. There could also be a hidden level in the shipyards where captured enemy technology is being reverse - engineered. Also, there might be a select group of people who know about a special power source that is being harnessed in the shipyards, which could potentially change the balance of power in the Galactica world.
Some popular ones include 'Battlestar Galactica: The Cylon War' which delves into the backstory of the Cylon - human conflict. Another is 'Battlestar Galactica: Blood and Chrome' that explores the early days of the Colonial Fleet and its battles.
Some popular 'Battlestar Galactica' fanfics might focus on alternate storylines for the main characters. For example, there could be fanfics that explore what would have happened if certain characters had made different decisions during crucial battles. Another type could be those that delve deeper into the relationships between characters, like a more in - depth exploration of the friendship between Starbuck and Apollo.