If Harry Potter were adopted by Poison Ivy in fanfiction, his view of the world could change drastically. He'd be exposed to a more nature - centric and perhaps a darker side of magic. Poison Ivy might train him to be more in tune with the natural world around him, and he could end up using plants in his battles against the dark forces in a very different way than he learned at Hogwarts. His relationship with his friends at Hogwarts might also be affected as he'd be brought up in a very different environment.
The fanfiction could start with Poison Ivy being magically transported to the wizarding world. She finds herself in the Forbidden Forest and starts to spread her influence among the native plants there. Harry Potter, while on a patrol in the forest, notices the strange changes in the plants and is the first to encounter Poison Ivy, leading to a tense first meeting between the two.
A 'Harry Potter is Poison Ivy fanfiction' might involve a cross - over of the two universes. Harry could find himself in Gotham City and interact with Poison Ivy's plant - based powers there. Or perhaps Poison Ivy somehow ends up at Hogwarts and causes chaos with her powers among the students and faculty. It would be a mix of magic and the more scientific - ish plant powers from DC Comics, which could make for some really interesting and unique storylines.
Naruto would likely have to get used to living among plants. He might start to learn how to communicate with them, just like Poison Ivy does. For example, he could learn to sense when a plant needs water or is under threat. He would also have to adapt to her more anti - social tendencies towards humans, which could be a real struggle for Naruto, who values human connections.
One trait Harry might inherit is a strong sense of self - preservation. Poison Ivy is always looking out for herself in her own world, and Harry could have that same instinct. This could make him more cautious in dangerous situations. Also, he might inherit her ability to blend in with her surroundings. Since Poison Ivy can use plants to camouflage herself, Harry could have a natural knack for hiding or remaining undetected in the wizarding world. Maybe he could use magic in combination with this ability to stay out of harm's way more effectively.
The idea of environmentalism is also quite common. Since Poison Ivy has such a strong connection to plants, fanfictions may use her presence in the Harry Potter world to bring up issues about the care and protection of magical plants and the environment in general. For example, she might try to influence how the Herbology classes are taught or advocate for better treatment of the Forbidden Forest.
Well, perhaps the female Harry Potter could have some of Poison Ivy's powers. She might use her new - found plant - controlling abilities to protect Hogwarts in a more unique way. For example, creating a living wall of thorns to keep out dark wizards.
One big challenge would be the difference in their moral compasses. Harry is generally a hero who follows a certain code of ethics in the wizarding world. Poison Ivy, on the other hand, has her own ideas about nature and often goes against the law to protect it. This could lead to a lot of internal conflict within their relationship.
In the 'Harry Potter Raised by Poison Ivy' fanfiction, it's likely that Harry's personality would be influenced. Instead of the somewhat sheltered upbringing at the Dursleys', he'd be in an environment where nature and a more unorthodox form of magic (from Poison Ivy's perspective) are dominant. This could make him more in tune with the natural world around Hogwarts, like the Forbidden Forest. He might be able to communicate with the magical creatures there in a different way, using the knowledge he gained from Poison Ivy.