Perhaps Harry is a male dryad who gets caught in the middle of a war between different magical creatures. He has to use his dryad abilities, like the power to communicate with plants and control them to some extent, to broker peace. He could also be in a relationship with a character from the original story (if it's a Harry Potter - based fanfiction), and their relationship is tested by his new identity as a dryad and the challenges that come with it. This would add an interesting layer of drama to the story.
I'm not sure about a specific 'Harry is a male dryad' fanfiction off the top of my head. You could try searching on fanfiction - specific websites like Archive of Our Own. They have a vast collection of different fanfictions and you might be able to find one that fits this description.
One plot idea could be that Harry meets the male model while on a visit to the Muggle world. Maybe he's trying to blend in and learn more about Muggle culture, and he bumps into this model. They start off as friends and gradually develop romantic feelings. Another could be that the male model has some sort of connection to the wizarding world that he's not aware of, and as Harry gets closer to him, he discovers this connection and it deepens their bond.
Well, perhaps Harry discovers that his cooking has the power to bring out the true nature of people. So he cooks for some of the more mysterious characters at Hogwarts to learn their secrets. Or he could start a cooking club at Hogwarts, which becomes a place for students from different houses to bond over food. There are so many possibilities when it comes to fanfiction plots related to Harry cooking.
One idea could be that baby Harry starts talking and reveals some hidden knowledge about the wizarding world. Maybe he talks about a future threat that no one else is aware of yet.
Maybe a spell goes wrong and causes a character to develop diabetes. The story could then be about how they adapt to this new situation. They might search for a magical cure within the wizarding world, or learn to live with it with the help of their friends, like Hermione using her research skills to find suitable magical remedies or ways to manage it.
Maybe Harry discovers a hidden part of Hogwarts where a Wendigo has been lurking. He has to use his magic skills to either defeat it or find a way to coexist with it.
A possible plot could be that in a post - apocalyptic world where magic and Asgardian powers are the last hope, Harry and Thor are brought together by fate. As mates, they must find a way to combine their powers and knowledge. Harry's knowledge of magic and Thor's brute strength and godly powers could be combined in unique ways to defeat the chaos that has befallen their world.
One plot idea could be that they use magic to transport themselves to Panthers games and have to keep it a secret from the wizarding world. Another could be that they meet other Panther fans in the wizarding world and form a secret fan club.
Perhaps in a 'harry potter yells fanfiction', Harry yells when he discovers that someone has been spreading false rumors about his friends. He could be in the Great Hall, stand up, and yell at the perpetrator, creating a big scene full of drama and conflict within Hogwarts.
One interesting 'Harry Potter Dryad' fanfiction could be one where a dryad helps Harry in the Forbidden Forest. Maybe she uses her connection to the forest to guide him through hidden paths and away from dangerous creatures.