The writer could also start by focusing on a character from one universe who stumbles upon an object or a phenomenon related to the other universe. For example, a Guardian could find a Prothean artifact, which then leads them to discover more about the Mass Effect universe and eventually meet its characters. This way, the story can gradually unfold as the character's curiosity drives the exploration of the crossover.
One idea could be to have the Guardians from Destiny encounter the Normandy crew in Mass Effect. They could team up to fight a common enemy like a new, powerful alien race that has the technology to disrupt both the Traveler's Light in Destiny and the Mass Relay network in Mass Effect.
Another plot could involve a shared enemy that exists in both universes. The combined forces of Mass Effect races and Destiny Guardians have to figure out how to defeat this enemy. They would need to overcome their differences in culture and combat styles to be successful.
Shepard and Cayde - 6 would be an interesting pair. Shepard is a skilled military leader, and Cayde - 6 is a witty and resourceful Guardian. Their different personalities and combat skills could lead to some great banter and teamwork.
One great 'Mass Effect' crossover fanfiction is 'Mass Effect and Star Wars: The Galactic Alliance'. It combines the rich lore of both universes in an exciting way, with characters from 'Mass Effect' interacting with those from 'Star Wars'. Another is 'Mass Effect meets Warhammer 40K', which creates a really unique and action - packed story as the two very different sci - fi settings collide. There's also 'Mass Effect and Halo: The United Front' that has some really interesting character dynamics between the heroes of the three franchises.
One great 'Fallout Mass Effect Crossover Fanfiction' is 'The Wasteland Beyond the Stars'. It combines the post - apocalyptic feel of Fallout with the space - faring adventure of Mass Effect really well. The main character from Fallout somehow gets transported to the Mass Effect universe and has to adapt to the new technology and politics there.
Well, Master Chief would likely start by assessing the threats in the Mass Effect universe. He'd notice the Reapers right away as a major threat. His military training would kick in, and he'd try to find ways to combat them. In terms of adaptation, he'd probably look for allies. He might be initially skeptical of the alien species but would soon realize that they can be valuable partners. For instance, he could team up with the Turians, who also have a strong military tradition. He'd also have to adapt to the different forms of transportation, like the Mass Effect relays. His first encounter with using one of these relays might be a bit of a shock, but he'd quickly figure out how to use it to his advantage.
One common theme is the clash of different cultures. The very different races in Warhammer and Mass Effect coming together often leads to interesting cultural exchanges and conflicts.
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.