There are fanfictions that explore Poison Ivy's backstory in the Arkham Knight world more deeply. For example, a story might focus on her early days and how she came to have such a strong connection with plants. This can add a lot of depth to her character in the context of the game's lore.
Another popular theme is her relationship with Batman. Sometimes it's a romantic relationship, other times it's a begrudging alliance. Writers like to explore how two such different characters interact and what they can learn from each other.
Some writers depict their relationship as a love - hate dynamic. Batman is attracted to Poison Ivy's beauty and her passion for nature, yet he hates her criminal ways. For example, he might be constantly in a struggle between his feelings for her and his duty to stop her crimes.
Sure, she is quite popular. She has a distinct look with her green - toned skin and plant - like features. Her character also has an interesting backstory which adds to her popularity. In the Arkham series, her battles against Batman are always exciting to see.
One common plot twist could be Poison Ivy using her powers in a new and unexpected way to either help or hinder Batman. For example, she might be able to control a new type of plant that has properties that can nullify Batman's gadgets. Another could be a situation where Batman has to make a difficult choice between saving Gotham and saving Poison Ivy from some greater threat. This would put his moral code to the test as he has always seen her as a villain but may have developed some complex feelings in the context of the fanfic.
One interesting aspect is her relationship with plants. She can control them and use them as weapons or to create barriers. Another is her environmentalist - like ideology which drives her actions, even if they are villainous. Also, her design is captivating, with her green appearance.
In Arkham Asylum, Poison Ivy's character can be studied through her interactions with the other inmates and the guards. Does she use her charm or her powers to get what she wants? How does she react to the restrictions placed on her? You could also look at her backstory and how her experiences led her to become the plant - loving villain. Maybe she was mistreated in the asylum in the past, and that fuels her current actions. Write about her emotions, her hopes (if any) for a better world for plants, and her despair at the state of the environment outside. This all helps in creating a well - rounded character study.
Perhaps a fanfiction where Poison Ivy falls ill due to some strange new chemical in Arkham Asylum. Batman, instead of seeing her as just a villain, decides to help her find a cure. This would lead to a journey through the asylum, facing other villains who might want to take advantage of Ivy's weakened state, and also a deeper exploration of Ivy's character and her connection to nature.
I once went camping and unknowingly walked right through a patch of poison ivy. At first, I didn't realize what had happened. But a few hours later, my skin started to itch like crazy. It spread all over my legs and arms. I had to rush to the nearest store to get some anti - itch cream. It was a horrible experience but also a memorable 'poison ivy story' for sure.