Well, there are fanfictions that center around a Prothean survivor who teams up with a human. They could be on a mission to stop a new threat that was once held at bay by the Protheans. In this story, the human would learn from the Prothean's ancient wisdom and advanced technology. The Prothean, in turn, would have to adapt to the modern ways of the humans. This creates an interesting dynamic as they work towards a common goal.
Some fanfictions might involve a human character being genetically linked to the Protheans in some way. For example, a human having Prothean DNA that gives them unique abilities. This could lead to a story where they are hunted by various factions who want to study or use their powers. Or perhaps a fanfiction where a human is sent back in time to the Prothean era and has to navigate their complex society while trying not to disrupt the timeline too much.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of Mass Effect fanfictions, and you can easily search for ones specifically about human - Prothean relationships or stories. Another option is FanFiction.net, which also has a good number of such fanfictions. Just use the search function and type in relevant keywords like 'Mass Effect', 'human', and 'Prothean' to narrow down your results.
There could be a fanfiction where the human signals are actually a form of ancient communication that was lost on Earth but has some deep significance in the wider Mass Effect galaxy. For example, it might be related to an ancient alien visitation on Earth long ago. In this fanfiction, the main character, perhaps a human Spectre, has to uncover the truth behind these signals and how they can be used for good or bad in the current political and military situation in the galaxy.
A great fanfiction could revolve around a human diplomat trying to negotiate a treaty with the quarians. A young quarian gets involved and they end up on an adventure to prove the importance of the treaty to both species. This story could explore the political and social aspects of the Mass Effect universe in relation to human - quarian relations.
This discovery in the fanfiction can also impact the understanding of the Reapers. Since the Protheans were the last cycle to fight the Reapers before humanity, any living Prothean could hold vital information about the Reapers' weaknesses or their long - term plans. This could change the power dynamics in the Mass Effect universe as humans might gain an edge in the fight against the Reapers. It also makes the role of humanity more important as they are now the keepers of this new Prothean knowledge.
Well, in such a fanfiction, a key plot point could be the initial discovery. The humans might be on a routine exploration of Mars when they stumble upon Prothean artifacts or even a dormant Prothean. This discovery would likely send shockwaves through the human community. Another point could be the struggle to understand the Prothean technology. Since the Protheans were highly advanced, humans would face challenges in deciphering their tech. There might also be a race against time to keep this discovery from falling into the wrong hands, like a rival faction or a group with malicious intent.
One interesting Mass Effect Phantom fanfiction could be about a Phantom's origin story. It might explore how they are trained, what their lives are like before being deployed in the field. Another could focus on a Phantom's unexpected alliance with a group of Shepard's crew, leading to a series of adventures that change the course of the main story. There are also fanfictions that might put a Phantom in a situation where they have to question their loyalty to the Cerberus or whoever they serve.
One interesting 'Mass Effect' lemon fanfiction could be those that explore the romantic relationships between different species in the 'Mass Effect' universe in a more detailed and emotional way. For example, a fanfiction about Shepard and Liara might delve deeper into their connection beyond what the game shows.
Some fanfictions might center around a Geth's relationship with a particular character. Maybe a Geth forms an unlikely alliance with a Krogan. The story could detail how they overcome their differences and work together towards a common goal, while also exploring the unique nature of the Geth's thinking process.
Some fanfictions could focus on the origin of vampires in the Mass Effect universe. It could be a result of some ancient experiment gone wrong, or perhaps they are an alien race that has evolved in a way that gives them vampiric traits. This could tie in with the existing lore of Mass Effect and create a really engaging story.
One interesting 'Mass Effect' baby fanfiction could be about the main characters having to protect a baby with special powers in the Mass Effect universe. Maybe the baby has some unique biotic abilities that draw the attention of both the good and bad forces.