It's difficult to say exactly without reading it. 'Harry is mad' might imply that his character experiences extreme emotions. It could be related to his relationships, like he's mad at his friends or in love in a maddening way. Fanfiction often takes the original character and puts them in new and interesting scenarios.
I'm not sure specifically if there is a fanfiction titled exactly 'Harry is mad at Neville', but it's very possible. Fanfiction writers often play with different character dynamics. Neville is a character who has his own insecurities and growth throughout the series, and Harry also has his own emotional journey. A story where Harry is mad at Neville could explore their individual personalities and how they resolve their conflict.
In some fanfictions, Ginny might be mad at Harry because of a misunderstanding. For example, she could misinterpret his actions towards another girl as being unfaithful. Maybe he spends a lot of time with Hermione on a project and Ginny thinks there's something more between them.
Yes, in some fanfiction interpretations, Harry Potter can be portrayed as a mad scientist. Fanfic writers often take creative liberties and might depict him exploring wild and unorthodox magical experiments, similar to what a mad scientist would do in a non - magical context.
One possible reason could be that he's worried about Ginny's safety during the pregnancy. He might be overprotective and his concern comes out as anger.
Maybe he loves the idea of the Firebolt in the fanfiction. It could be that the stories expand on his experiences with the Firebolt in a really exciting way.
Perhaps in the fanfiction, Sirius is mad at Harry because Harry has befriended someone Sirius doesn't trust. Sirius, being protective of Harry, might see this new friendship as a threat. He could be worried that this person will lead Harry astray or put him in danger, and his anger towards Harry stems from his concern for Harry's well - being.
The mad scientist in Harry Potter fanfiction is usually a figure of chaos. They might be working in some hidden lair, away from the prying eyes of the Ministry of Magic. Their experiments could range from trying to bring inanimate objects to life to creating new forms of magic that are either very powerful or extremely dangerous.
It could be due to jealousy. Perhaps Ginny has been spending a lot of time with another character, and Harry misinterprets their relationship, leading to his anger. In fanfiction, the writers often play with such emotions to create drama.
One of the most memorable is probably a wizard named Malachi in some fanfictions. He's mad because he was rejected by the Ministry of Magic for being too radical in his magic studies. So he goes on a rampage, using his unique and often dangerous spells against anyone who gets in his way. His character is really interesting because he has a complex backstory that makes you understand his madness a bit more.
A 'Harry Potter' fanfiction can be considered 'mad genius' when it takes the existing lore and twists it in a completely unexpected way. For instance, if it gives a new backstory to a well - known character that changes how we perceive them. It could also be the use of magic in an unorthodox manner. Like in some fanfics, magic is combined with modern technology in a really clever way.