One idea could be that Poison Ivy is causing chaos in the city by making plants overrun certain areas. Spiderman, being the hero, tries to stop her but realizes that her motives are not entirely evil. Maybe she's trying to save a park from being demolished. So, instead of fighting, they team up to find a solution that benefits both the city and the plants.
Another concept could be a crossover where Poison Ivy somehow gets transported to Spiderman's universe. At first, Spiderman is suspicious of her. But as they interact, they find out that they both have a love for nature in different ways. Spiderman protects the people in the city, which includes protecting the natural areas, and Poison Ivy wants to protect plants. They could learn from each other's methods.
Well, a cool concept could be that Poison Ivy uses her powers to create a special kind of plant that can neutralize Spider - Man's powers for a short time. This forces him to rely on his wits and non - superhuman skills. In turn, Spider - Man tries to convince her that there are better ways to protect the environment than her extreme methods. They start to understand each other's perspectives more as the story unfolds.
Spiderman could try to reason with Poison Ivy. He might say that her actions of using plants to attack are harming innocent people. For example, when she makes vines wrap around buildings, it could endanger those inside. He would appeal to her sense of justice and ask her to find a more peaceful way to promote plant growth.
One idea could be that Poison Ivy kidnaps Robin to use him as a bargaining chip against Batman. Maybe she wants Batman to stop interfering in her environmental plans. So she holds Robin in her lair, which is filled with all kinds of dangerous plants.
In a fanfiction, their relationship could develop through a series of encounters. For example, Spider - Man could accidentally damage some of Poison Ivy's precious plants while swinging around the city. This angers her, and she targets him. But as they clash, they also start to learn about each other. Spider - Man realizes that Poison Ivy has a valid point about protecting nature, and Poison Ivy sees that Spider - Man is not just a pest but a hero with good intentions. Over time, this could lead to a more complex relationship that includes elements of friendship or even a strange kind of attraction.
One idea could be that Danny Phantom gets transported to Poison Ivy's world. He has to deal with her plant - based powers while trying to find a way back home. Maybe he teams up with her against a common enemy who is threatening both the Ghost Zone and the natural world.
In this fanfiction, the gods in Percy Jackson's world are intrigued by Poison Ivy's power. They bring her to Olympus to study her. Percy is assigned to be her guide while she's there. Along the way, they discover that there are similarities between the magic in Poison Ivy's world and the divine powers in Percy's world. They start to experiment with combining their powers, like Percy using his water powers to help Poison Ivy's plants grow in unexpected ways, and Poison Ivy using her plants to create shields for Percy during his training sessions.
One idea could be a fanfiction where Poison Ivy teams up with another villain, like the Joker. They could have a really strange alliance. Maybe she uses her plant powers to help him with one of his crazy schemes, but in the end, she double - crosses him because she realizes his plans are too chaotic even for her. It would be an interesting exploration of her character and how she interacts with other villains in the Batman universe.
One idea could be that Captain Marvel and Spiderman team up to fight a powerful alien threat that has invaded New York City. Spiderman uses his agility and web - slinging skills to distract the alien while Captain Marvel blasts it with her energy powers.
One idea could be that Spiderman gets transported to Equestria where he meets Twilight Sparkle. They could team up to stop a new villain that is causing chaos in both the human world and Equestria, perhaps a villain who has the power to open portals between the two worlds and is using it to steal valuable things from both. Twilight could use her magic to help Spiderman understand the new world he's in, and Spiderman could use his combat skills to protect Twilight when they are in dangerous situations.
Yes, there are quite a few. You can start by looking on fanfiction.net or Archive of Our Own. These platforms have a wide range of stories that combine the characters of Spiderman and Poison Ivy. Some might focus on their unlikely alliance, while others could explore a romantic relationship between them in a really creative and interesting way.