A more complex interaction could be that Athena, in an attempt to test the human concept of justice, places Batman in various moral dilemmas. Batman, using his own sense of right and wrong along with the wisdom Athena has shared with him, has to make difficult decisions. This interaction would explore the differences and similarities between divine and human ideas of justice.
Perhaps Athena, seeing Batman's dedication to justice, decides to bestow upon him a special power or tool. This could be something like a shield with special properties that can protect him from the most dangerous attacks of his enemies. In return, Batman could offer her his unwavering commitment to the ideals of justice as a form of worship or respect.
They could interact through Batman's dreams. Athena could visit him in his sleep, sharing her wisdom and giving him cryptic messages that he then has to decipher in his waking life to solve crimes or deal with threats in Gotham.
Well, Batman's dark and somewhat cynical personality can be a contrast to Wonder Woman's more positive and hopeful nature. In stories, this can lead to some great dialogue. He might question her faith in the power of Athena, while she tries to show him the good that can come from it. At the same time, they both have a strong sense of justice. So when it comes to protecting something related to Athena's influence, they can find common ground and work together effectively.
Batman could interact with them by first trying to understand the Mad Hatter's motives for involving Alice. He might start by observing the Mad Hatter's actions from the shadows. When it comes to Alice, he would approach her carefully, as she may be scared or confused. For example, he could offer her protection from the Mad Hatter's schemes.
In a different scenario, Batman is transported to the realm of Athena in some sort of magical accident. There, he has to prove himself worthy to her. He learns from her about justice in a different light, not just the street - level justice he's used to in Gotham. When he returns to Gotham, he has a new perspective on how to deal with crime and corruption.
They could start by trying to understand the different rules of that world. Since Batman's world is more grounded in detective work and street - level crime fighting compared to the Avengers' world of superpowers and global threats. The Avengers might use their powers to help solve some of the complex mysteries in the Batman fanfic world. For example, Vision could use his ability to see through objects to find clues that Batman might miss.
Sasuke would likely be aloof and guarded at first. He might see Batman as just another 'vigilante' like some of the shinobi in his world. Batman, on the other hand, would be cautious and try to figure out Sasuke's motives. Eventually, they could start sharing their combat techniques. Sasuke might show Batman how to use chakra in combat, and Batman could teach Sasuke about the importance of having a strong moral code.
Percy could interact with them in a variety of ways. For example, he might approach Athena in her temple seeking knowledge about the lemon. Athena, being the goddess of wisdom, could provide him with some cryptic clues. With Artemis, Percy could be on a joint mission where the lemon is somehow involved. Artemis, with her fierce independence, might initially be hesitant to work with Percy but then realizes they need each other.
Batman would likely be very reserved and cautious at first when interacting with The Incredibles. He's used to working alone most of the time. For example, when he meets Mr. Incredible, he might be initially skeptical of Mr. Incredible's more straightforward and sometimes over - confident approach. But as they get to know each other, they could start to respect each other's strengths. Mrs. Incredible might be intrigued by Batman's gadgets and try to learn more about them. Dash could be excited to see Batman's cool vehicles and try to race them. Violet might be a bit shy around Batman at first but could later open up and share her experiences of using her powers in a different way than Batman uses his skills.
Some fanfictions show Slade taunting Nightwing about his relationship with Batman. This can create tension between Nightwing and Batman as Nightwing might feel the need to prove his independence. Batman, in turn, may be overly protective, which Slade can use to his advantage. The interactions can also lead to unexpected alliances. For instance, in some stories, Slade and Nightwing might have to work together briefly against a common enemy, much to Batman's dismay.
The Joker from Batman Begins could play a really interesting role. He might see the Avengers as a new kind of chaos to introduce. He could try to manipulate some of the more hot - headed Avengers like Thor. He would play mind games with them, which would be very different from the usual physical battles they face. Batman would then have to step in and use his understanding of the Joker to stop him from causing too much division within the Avengers.
Supergirl's exuberance and her willingness to trust can sometimes clash with Batman's more cynical view. However, in the context of a romance in fanfiction, this can be a source of growth for both of them. Batman might start to trust more because of Supergirl, and Supergirl might become more cautious under Batman's influence. Their personalities also play a role in how they show affection. Batman might be more reserved in his displays, while Supergirl could be more open and affectionate, which could lead to some sweet and sometimes awkward moments as they navigate their relationship.