Well, in 'xcom mass effect crossover fanfic', perhaps a cool concept is the interaction of the characters. Imagine Commander Shepard teaming up with XCOM operatives. They could share their combat strategies and knowledge. Also, the idea of using Mass Effect's biotics in XCOM missions or having XCOM's psi - ops in the Mass Effect universe could add a whole new layer of excitement to the story.
Definitely Commander Shepard from Mass Effect. He/She is the central character in Mass Effect and would be a natural fit to interact with XCOM forces. Also, XCOM's Central Officer or top - ranking soldiers could be prominent. They could be the ones making decisions on how to deal with Mass Effect threats or form alliances.
Shepard from Mass Effect could be a main character. They could lead the XCOM forces in a joint mission against a common enemy. Their leadership skills would be very useful in coordinating the two very different groups.
Another aspect could be the exploration of the political and cultural differences between the two universes. XCOM is mainly focused on Earth defense, while Mass Effect has a complex galactic political system. A fanfiction could explore how the two groups interact when it comes to things like trade, alliances, and dealing with common threats. For instance, how would the XCOM Council (if there was one in the crossover) deal with the Citadel Council's decisions and vice versa?
One idea could be having the XCOM soldiers use their combat skills in the Mass Effect universe. Maybe they are sent to help fight against the Reapers. They could introduce their unique tactics and weaponry to the Mass Effect races.
Shepard from Mass Effect is a very likely character. Given their leadership skills and experience in dealing with various alien threats, they would be a natural fit in a crossover. They could potentially lead XCOM forces or at least be a key figure in coordinating between the two universes.
One interesting concept could be the combination of different species from the Mass Effect universe in unexpected ways. For example, seeing a Krogan and a Salarian working together in a situation that defies their usual cultural norms. Another concept might be the introduction of new technologies or powers that blend the characteristics of different Mass Effect races.
The best Stargate and Mass Effect crossover fanfics are the ones that blend the lore seamlessly. In some, we see the Asari being intrigued by the Ancient technology from Stargate. They might try to study it, leading to interesting cultural exchanges. Some fanfics also play with the idea of the Mass Relay system and how it could interact with the stargate network. It's all about creativity and how well the author can mesh these two distinct universes together.
A common theme is the clash of cultures. Naruto's shinobi world has its own set of values and traditions, while Mass Effect has a very different galactic culture. Fanfics often explore how these two cultures interact, like how Naruto's sense of loyalty and friendship is received by the various species in Mass Effect.
Liara is frequently featured in 'mass effect crossover fanfic'. Her knowledge of Prothean technology and her overall intelligence can be used in various crossovers. For example, in a cross - over with a more magical - based science - fiction universe, her understanding of ancient technology could be a bridge between the two worlds. Another popular character is Tali. Her skills as an engineer and her relationship with Shepard make her a natural choice for fanfic authors to include in crossovers.