Dean might be jealous of Harry in fanfiction for a number of reasons. Harry has a unique connection to Voldemort, which makes him sort of a chosen one. This gives him a special status that Dean doesn't have. Harry also has a lot of cool magical items like the Invisibility Cloak. Dean may look at all these things and feel a bit envious. Moreover, Harry is often the center of attention when it comes to romantic interests too, which could be another factor.
There might be some fanfiction out there with such themes in the vast world of Harry Potter fan creations, but it may not be mainstream. Fanfiction often explores diverse relationships and emotions. However, it's important to note that much of the official Harry Potter series doesn't focus on such adult - themed content.
One possible fanfiction could be where Hermione gets jealous when Ron starts spending a lot of time with a new female student in Hogwarts. She starts acting out in class and Ron doesn't understand why at first. Then, Harry has to step in and make Ron realize that Hermione might be feeling left out. This could lead to a big argument between Ron and Hermione which Harry tries to mediate.
Well, one possible scenario in such a fanfic could be that Harry Potter is jealous of Percy Jackson's connection to the sea. Since Harry has his own element of water in the form of the Black Lake at Hogwarts, but Percy has this vast and powerful connection to all of the oceans. It could create a really interesting dynamic where Harry feels overshadowed in a way.
A simple way would be through their powers. Harry sees Percy's instant and powerful control over water, while his own magic related to water is much more limited. This makes him envious.
The theme of self - discovery through jealousy is also present. When Ron is jealous, he might start to question his own worth in the friendship and in the wizarding world. He could then strive to improve himself, like trying to be better at magic or more confident. Similarly, Hermione and Harry also go through this process of understanding themselves better because of their jealous feelings.
One possible scenario is that Harry masters a new and powerful form of magic that Voldemort has been unable to attain. For instance, if Harry discovers a way to combine different branches of magic in a unique way that gives him an edge in battles. Voldemort, who has always been obsessed with power and being the most powerful wizard, would surely be jealous of Harry's newfound abilities.
She might act overly friendly with other guys. For instance, she could be really touchy - feely with them, like hugging them a bit too long or playfully hitting their arms. This would make Harry jealous as he wants her attention all to himself.
Well, it could be that in fanfiction, Percy is depicted as having skills or qualities that Harry lacks. For example, Percy might be really good at academic magic, which Harry struggles with at times. Also, Percy may have a more stable family situation compared to Harry. This disparity can lead to Harry feeling jealous. Additionally, if Percy is shown to be getting more recognition for his deeds in the fanfic, that would surely make Harry envious.
Well, it could be that in the fanfic world, Dean has certain skills or qualities that Harry wishes he had. Maybe Dean is really good at Quidditch all of a sudden and getting all the attention, and Harry, being used to being in the spotlight in that area, feels a bit jealous. Also, if Dean is making more friends or is more popular in the story, Harry might be jealous as he has his own insecurities.