A possible plot is that Naruto is sent on a mission to a strange new world where he meets Poison Ivy. She initially sees him as a threat but as she discovers his kind heart, she starts to trust him. In the harem scenario, some female characters from Naruto's universe get accidentally transported too. They form an unlikely group, with Naruto in the middle. They face challenges like dealing with Poison Ivy's toxic plants that have gone out of control and trying to find a way back home while also developing relationships among them.
One interesting plot could be that Naruto, with his unique abilities, enters Poison Ivy's world. He tries to understand her powers over plants and how they can be used for good. In the harem aspect, other characters from Naruto's world might be brought in, like Sakura and Hinata. They all have to learn to co - exist with Poison Ivy and her plant - based ecosystem. Maybe they work together to protect a forest that is being threatened by some dark force.
Perhaps in this fanfiction, Naruto is cursed and ends up in Poison Ivy's domain. Poison Ivy, being the mistress of plants, tries to find a cure for him. Meanwhile, Naruto's charm starts to attract some of the female characters in Poison Ivy's world as well as some of his own friends who have come to find him. The harem dynamic develops as they all compete for Naruto's attention while also having to deal with the various plant - related mysteries and threats in Poison Ivy's territory.
A cool plot could be that Ben 10's Omnitrix malfunctions near Poison Ivy. This causes some of his alien DNA to mix with her plant - based essence. As a result, they both gain new and strange powers. They then have to figure out how to control these powers while also dealing with villains who want to use this new situation for their own evil plans. Or, there could be a story where Poison Ivy is initially suspicious of Ben 10 because of his alien nature. But when she sees how he respects nature in his own way (through his alien forms' relationships with different environments), she warms up to him. Together, they could go on a journey to save a forest that is being destroyed by a powerful and greedy corporation. Ben 10 uses his strength and agility as different aliens, and Poison Ivy uses her plants to slow down the corporation's machines and workers.
Perhaps in the fanfiction, Poison Ivy has developed a new type of plant toxin that can neutralize Batman's gadgets and physical abilities. For example, it could corrode his Bat - suit and make his grappling hook malfunction. Without his usual tools and skills, Batman would struggle and ultimately lose to her devious plans.
One possible plot could be Poison Ivy using her plant powers to create a special lemon - like plant that has an effect on Batman. Maybe it makes him see illusions of a different Gotham, and he has to fight his way through this strange new world while also dealing with Poison Ivy's motives for creating it.
One possible plot could be that Poison Ivy uses her powers to save Robin from a dangerous situation. In the heat of the moment, overcome with gratitude and a new - found understanding of each other, they share a kiss. This could then lead to a complex relationship where they have to navigate their different loyalties and natures.
One possible plot could be that they are in a garden, Poison Ivy's domain. As they kiss, the plants around them start to grow and bloom more vibrantly, as if sharing in their joy. It could symbolize their relationship making the world around them more alive.
Obviously Naruto would be one of the main characters. He has a strong personality and unique abilities that would make him stand out in this crossover. Poison Ivy would also be a main character as she is the central figure in her own world. From Naruto's world, Sakura could be part of the harem. She is strong - willed and her medical skills could be useful. Another could be Ino. She has her mind - related jutsu which could create interesting interactions with Poison Ivy's plant - controlling abilities.
One interesting storyline could be Poison Ivy trying to convert Batman to her environmentalist views. She might use her powers to show him a future where Gotham is destroyed by pollution and convince him that her extreme methods are necessary. Another could be a story where Batman has to rescue Poison Ivy from a more dangerous villain who wants to use her powers for evil. This would put them in an unexpected alliance situation.
In some Poison Ivy pheromones fanfiction, her pheromones are explored as a way to gain power over others. This might lead to complex power dynamics where she has to decide how far she'll go. Also, there could be the idea that her pheromones have a different effect on animals, and she uses this to her advantage in certain situations. It can make for really interesting plots where she has an unusual form of control over the environment.
One interesting Poison Ivy kiss fanfiction could be about her kissing a hero in an unexpected alliance. Maybe she kisses Batman as a form of distraction during a battle, but there's an underlying, unspoken attraction that adds a whole new layer to their relationship.
A plot could be that Poison Ivy is wrongly accused of a crime she didn't commit. She has to clear her name while also dealing with the other villains who see this as an opportunity to take advantage of her. Batman, initially believing she's guilty, starts to have doubts as he investigates further. This would add a layer of mystery and character development for Poison Ivy.