A military officer could be the main character. During the first contact with the Reapers, they are in charge of the initial defense strategies. They have to make tough decisions about how to deal with the unknown threat, and their leadership skills and military training would be put to the test as they try to protect humanity from the Reapers.
An ordinary citizen could be the main character in this fanfiction. This person might be in the wrong place at the right time during the first contact with the Reapers. They could have some unique quality, like being extremely observant or having a natural ability to understand alien motives, that makes them important in the events that unfold. Maybe they end up being the one to inspire others to fight against the Reapers when all seems lost.
A possible plot could involve a time - traveling aspect in the 'human first contact reaper fanfiction'. A future human, who has seen the destruction caused by the Reapers, travels back in time to the moment of first contact. This person tries to use their knowledge of the Reapers' weaknesses to stop them from ever establishing a foothold on Earth, but they have to deal with the disbelief of the people in that time period.
Maybe a human scientist who has studied the reapers for a long time could be one of the main characters. He discovers a way to make the alliance possible. And on the reaper side, a young reaper who is more open - minded than the others and is willing to work with humans. The two of them could be the central figures in the fanfiction, with their relationship growing as they face various challenges together.
An asari explorer might be one of the main characters. She could be the one who stumbles upon human colonies or ships first. Her curiosity and open - mindedness would lead her to initiate contact, despite the potential risks. The story could follow her adventures as she tries to bridge the gap between their two species.
Often, there's a human military leader. He's the one who has to make tough decisions during the war, like whether to engage in a battle or try for peace. Then there could be a turian diplomat who is trying to understand humans better.
Well, it could start with a lot of suspicion. The humans might assume the Geth are hostile right away because of their robotic appearance. The Geth, on the other hand, might be analyzing the humans' biological and technological aspects. Maybe there would be a stand - off at first, with both sides trying to figure out if the other is a threat.
There could be a brilliant scientist as a main character. This scientist might be the one who discovers the key to defeating the aliens, like finding a way to neutralize their powerful shields. For example, Dr. Smith who has been working in a top - secret lab for years.
Maybe a kind-hearted storyteller. They have the ability to communicate with the animals in the Lion King world through their stories. The animals are fascinated by the human's tales and the storyteller uses this to bring peace and unity among different animal groups, especially during times of conflict. They could also use their stories to inspire Simba to be a better leader.
Well, it could be about humans and reapers teaming up to fight a common enemy, like an even greater evil from another dimension. They might combine their unique skills and technologies to achieve victory.
A human scientist could also be a main character. The scientist could be part of a team studying the Turians' technology during the war. They might accidentally discover a way to end the war but have to convince both sides to trust them. Their knowledge of science could be the key to peace, but they face a lot of opposition from military leaders on both sides.
One great fanfiction about the human - Krogan first contact in Mass Effect could be 'The Meeting of Two Races' on a popular fanfiction site. It really delves into the initial misunderstandings between the two species. The humans are cautious, while the Krogan are more brash. It shows how they start to communicate through simple gestures at first.