In this fanfiction, perhaps John is injured and the goddess he meets uses her otherworldly powers to heal him. As they interact, they start to understand each other's worlds better, and John realizes that there are forces in the Halo universe far greater than he thought. She could also guide him to a hidden weapon or technology that will be crucial in the fight against the Covenant.
She could be an ancient Forerunner who has been in stasis for millennia. The Forerunners were extremely advanced, so it would make sense for one of them to seem like a goddess with their technology and knowledge.
Another possibility is that Halo John meets Demeter. Demeter is associated with the harvest and the earth. She might be curious about John's world and how they sustain themselves without relying on the earth in the same way as the Greek world. John could share stories of the artificial food sources in the Halo universe. In return, Demeter could show John the beauty and power of the natural world in the Greek realm. This could lead to a cultural exchange of sorts between them.
One possible scenario could be that Halo John is on a quest in a world where the Greek gods exist. He meets a Greek goddess, perhaps Aphrodite. She might be intrigued by his otherworldly appearance and the technology he wields from the Halo universe. They could engage in a conversation about the differences between their worlds, like how Halo's world is more about advanced technology and combat, while the Greek world is filled with magic and mythology.
Well, usually in such a fanfiction, it could be that Lasky gets into a combat situation where he's outnumbered. John, being the super - soldier he is, just happens to be in the vicinity. Maybe Lasky's unit is under attack by Covenant forces and John detects the distress signal. He then uses his combat skills and advanced weaponry to fight off the enemies and save Lasky.
The goddess could be a new character created specifically for the fanfiction. Maybe she's a being from an ancient magical civilization that has been dormant for ages.
After John saves Lasky, they probably start with a sense of respect. Lasky is in awe of John's combat skills and heroics. John, on the other hand, respects Lasky's leadership and strategic thinking. They might begin to trust each other more as they work together on subsequent missions.
Well, it could be that the goddess helps Harry discover a new aspect of magic. She might teach him some ancient spells or show him hidden magical realms. Harry, in turn, could introduce the goddess to the wizarding world he knows, like Hogwarts and its unique traditions.
In this fanfiction, Izuku might get involved in John Wick's world of assassins. He could use his Quirk in unexpected ways to help John Wick out of a tough situation. For example, his super strength could be used to break through barriers during a chase or his speed to quickly retrieve an important item. John Wick, on the other hand, would show Izuku how to be more stealthy and efficient in combat without relying solely on his Quirk.
In a fanfiction where John Wick meets The Punisher, there would be a clash of personalities at first. John Wick is more of a lone wolf who follows his own set of rules within the assassin world, while The Punisher is on a personal crusade against all criminals. But as the story unfolds, they could find common ground. For example, they could both be targeting the same drug lord or crime syndicate. John Wick might be in it for personal reasons like revenge, while The Punisher sees it as part of his mission to rid the world of evil. Their combined efforts would make for an exciting and action - packed fanfiction, full of intense gunfights, hand - to - hand combat, and strategic planning against their enemies.
One idea could be a crossover where the characters from RWBY end up in the Halo universe. They might team up with John and Cortana to fight a common enemy, like a new type of Grimm that has somehow made its way into the Halo world. Another plot could involve the sharing of technology or powers between the two groups. For example, Ruby's scythe skills could be combined with John's combat training to create a unique fighting style.