One common theme is the relationship between the female Shepard and the geth. It could be about building trust and understanding, as the geth are an alien species in the Mass Effect universe. For example, the story might focus on how Shepard helps the geth to rebuild and in the process, they form a unique bond.
You can start by searching on popular fanfiction websites such as Archive of Our Own (AO3) or FanFiction.net. Use the search terms 'geth rebuild' and 'female Shepard' on their search bars to see if there are any relevant stories available.
In a fanfiction like this, the story could focus on Female Shepard's struggle to balance her Geth - influenced upbringing with the expectations of the rest of the galaxy. For example, she may face challenges when dealing with the Alliance, which has a history of conflict with the Geth. Her loyalty could be constantly tested as she tries to bridge the gap between two very different worlds.
One possible plotline could be that the Geth see Female Shepard as a key figure in the fight against a common enemy, like the Reapers. So they use their advanced technology to resurrect her to help in the battle.
In this fanfiction, Female Shepard's appearance and combat style could also be influenced by the Geth. Maybe she has some Geth - inspired augmentations that make her more formidable in battle. Her backstory would be a fascinating exploration of how a human can be raised by an alien race of machines, and how that shapes her into the hero (or anti - hero) she becomes in the story.
One idea could be that the resurrected Female Shepard has to deal with a new threat that emerged during her time of 'death' and the Geth play a crucial role in helping her understand this new enemy. Maybe some of the Geth have developed new abilities during this time as well.
A plot twist could be that the Geth resurrected Shepard not fully as herself. There are hidden memories or abilities that start to surface as she goes through various challenges. These could be related to an ancient prophecy or a long - forgotten experiment.
Well, another option is to check out some Mass Effect - related forums. There are often threads where fans share and discuss their favorite fanfictions. Reddit has some great Mass Effect communities where someone might have recommended a story with that plot. It might take a bit of digging through the posts, but it could be worth it.
There might be a villain who is either a human supremacist trying to eliminate her because of her alien blood, or an alien warlord who wants to use her for his own gain. This villain would constantly be a threat to her and her friends, creating a lot of conflict and drama in the story.
In some fanfictions, Female Shepard's powerful biotic abilities are enhanced by ancient artifacts. These artifacts might be discovered during a side mission, and once she gets hold of them, her biotic powers become so strong that she can even move entire structures with her mind. For instance, she could use her new - found power to collapse a building on top of a horde of enemies, crushing them all.