She could be portrayed as a powerful magic - user who aids the Justice League with her unique skills. Maybe she uses her spells to solve problems that the League's normal powers can't handle, like using a spell to break through a magical barrier that's blocking their way.
Hermione in a Justice League fanfiction could have an interesting dynamic with the other members. She might start off as an outsider, with the League initially being skeptical of her magic. But as she proves herself time and again, she becomes an integral part of the team. She could also have a special bond with certain members, like Batman, who also relies on his intelligence. They might exchange ideas on how to outwit their enemies, with Hermione bringing in her knowledge of ancient spells and potions, and Batman his detective skills and vast array of gadgets.
Hermione is used to working in a team at Hogwarts. So she would likely adapt well to the Justice League's group dynamic. She could form special bonds with different members. For example, she might bond with Wonder Woman over their mutual strength and intelligence. And with Flash, she could share her experiences of using quick thinking in difficult situations. Her presence would add a new layer of complexity and versatility to the League's interactions.
Often, the Justice League's hatred for Batman in fanfiction is demonstrated by their actions. They might exclude him from important missions or decisions. For instance, they could form a subgroup within the league and intentionally leave Batman out, showing that they don't want him involved. This can also be seen in the way they interact with his ideas. They may quickly dismiss any suggestions he makes without proper consideration just because of their dislike for him. And sometimes, they may even plot against him in the fanfiction, trying to undermine his influence within the Justice League.
In many Young Justice fanfictions, Supergirl can be portrayed in various ways. Sometimes she's shown as a powerful and somewhat naive newcomer to the team. She might struggle to fit in with Earth's customs while still being eager to prove herself. For example, she could be depicted as being overly enthusiastic in battles, which might cause some initial friction with the more experienced members of the team.
Thor would likely be portrayed as a powerful and proud warrior. His noble nature would shine through as he fights alongside the Justice League. He'd probably be a bit brash at times, charging into battle without much hesitation, but also showing great loyalty to his new comrades.
In some fanfictions, Hermione as a Greek goddess might be portrayed as extremely intelligent, just like in the original 'Harry Potter' series. She could use her wisdom, which is a trait often associated with Greek goddesses like Athena, to solve complex problems within the fanfiction's plot.
In Hermione - centered Beauty and the Beast fanfiction, she may also have different relationships with the other characters. The Beast might be more intimidated by her at first because of her magical abilities. And the enchanted objects in the castle could be in awe of her intelligence. For instance, she could use her knowledge of potions to try and find a cure for the Beast's curse, while also forming unique bonds with the talking teapot or candlestick.
Often, she is a character full of contradictions. On one hand, she has the potential for great power due to her family lineage. On the other hand, she is determined to be different from Grindelwald. In fanfiction, this can lead to interesting storylines where she has to face challenges from both those who fear her because of her family name and those who want to use her for their own dark purposes.
The Flash might initially be in denial. He's used to Batman always having a plan and his death would be a huge shock. He would then turn his speed into a tool for investigation, trying to find out exactly what happened. Green Lantern could feel a sense of loss but also be spurred into action, using his ring to try and prevent future tragedies like Batman's death. He might create constructs in Batman's memory to inspire the team.
One possible plot could be She - Hulk joining the Justice League on a mission to stop a powerful alien threat. She - Hulk's strength and legal expertise could come in handy. For example, she might use her knowledge of the law to deal with any diplomatic issues that arise during the mission while using her brute strength to fight the aliens.
Perhaps a story where Hermione is seen as a threat by some members of the Justice League at first. They don't understand her magic and think it could be too dangerous. But then, when a common enemy emerges that is immune to their usual methods of attack, Hermione steps in and uses her magic to save the day. This could lead to a story of acceptance and friendship, with her joining the League on certain missions and using her unique skills to complement the League's existing powers.