One interesting story could be about Batman being tempted by the power of the Yellow Lantern ring. Maybe he struggles with the fear - based power it offers while still trying to uphold his own code in Gotham. For example, he might face off against his rogues gallery in a new way, using the yellow energy but also fighting not to be fully consumed by it.
Batman and the Yellow Lantern could start off as enemies. Batman is all about justice and the Yellow Lantern's power is based on fear, which goes against Batman's principles. So there could be a lot of tense confrontations at first.
Well, obviously Batman himself is the main character. He's the one who gets caught up in the Yellow Lantern concept. Then there are often the Yellow Lantern Corps members. Characters like Sinestro might make an appearance as he is a major figure in the Yellow Lantern Corps. They would be the ones trying to influence Batman or fight against him depending on the plot.
One idea could be Batman being forced to team up with a Yellow Lantern to stop a common enemy. Maybe a powerful villain from the fringes of the universe is threatening Gotham and the Yellow Lantern has some knowledge or power that Batman needs.
Perhaps in the fanfiction, the Red Lanterns see Batman as a potential asset. They manipulate events in Gotham to push Batman to his breaking point, causing him to embrace the Red Lantern power. Batman then has to figure out how to use this new power without losing his identity. He might try to reform the Red Lanterns from within, using his own code of ethics to influence them.
I really like the fanfic 'Lantern's Light in Gotham's Shadows'. In this story, the Green Lantern visits Gotham and ends up collaborating with Batman to take down a powerful and mysterious criminal organization. The story does a good job of showing how their different methods of crime - fighting can work together.
One great 'batman and green lantern fanfiction' is 'The Emerald Knight and the Dark Detective'. It combines their unique skills and personalities really well. The story has them team up against a common enemy that threatens both Gotham and Oa. It's full of action and great character interactions.
If Batman becomes a Lantern in fanfiction, he would gain the power of the Lantern ring. This could enhance his combat abilities even further. He might use the ring's energy constructs in his crime - fighting, creating things like shields or grappling hooks. His detective skills combined with the Lantern powers would make him an even more formidable force in Gotham.
There are definitely some. However, the quality can vary a great deal. Some might focus more on action and adventure within the context of their relationship, while others could be more centered around their emotional bond. It really depends on what you're looking for in a fanfiction. If you like deep character exploration, look for stories that seem to have a lot of introspection for both Batman and Green Lantern.
By introducing Yellow Lantern elements into Hogwarts. For instance, a Yellow Lantern could visit Hogwarts and start influencing students with the power of fear. This would create chaos and force the professors and Harry Potter and his friends to deal with this new threat.