One idea could be that the Green Lantern Corps discovers a threat that has its origin in the Marvel Universe, like a powerful artifact from Asgard that is being misused. The Green Lanterns then have to team up with the Avengers to retrieve and safeguard it. Another plot could involve a character like Hal Jordan being accidentally transported to the Marvel Universe and having to work with Spider - Man to find his way back home while also facing a common enemy.
A 'Green Lantern Arrow Crossover Fanfiction' often combines the unique elements of both Green Lantern and Arrow. It might bring together their powers, like the Green Lantern's power ring and Arrow's archery skills. For example, they could team up to fight a common enemy that neither could defeat alone.
Hal Jordan from Green Lantern and Iron Man from Marvel would be a great team - up. Hal is a fearless test pilot turned Green Lantern, and Iron Man is a brilliant inventor. They could combine their skills in combat and technology. For example, Hal could use his ring constructs to assist Iron Man in creating new and more powerful armors, while Iron Man could help Hal upgrade his ring's capabilities with his advanced tech knowledge.
A common theme is the clash of different power sets. For example, when Green Lantern crosses over with a character like Wolverine, you have the technological and will - based powers of the Lantern against Wolverine's mutant healing and claws. This creates interesting combat and cooperation dynamics.
The theme of justice is also prevalent. Both Green Lantern and Arrow are heroes who strive for justice in their own ways. In crossovers, they might have different ideas about what justice means in different situations. For instance, the Green Lantern might be more concerned with universal justice, while Arrow is focused on the justice in his city. This difference in perspective can create conflict and also opportunities for growth and understanding between the two characters.