In the 'Harry Potter hides in power station' fanfiction, the power station could be a secret location known only to a select few in the wizarding world. Harry might be hiding there because it's a place where Muggle technology and magic can interact in strange ways. He could be using the Muggle technology in the power station to his advantage. For instance, the large generators could be used to create a magical barrier or distraction. Also, there could be some sort of prophecy or clue that led him to the power station as a hiding place.
Maybe Harry is on the run from some dark forces and he finds the power station as an unexpected hiding place. He could be using the complex structure and machinery of the power station to evade detection, perhaps with some magical twists like using spells to blend in with the electrical currents or machinery.
It could be Death Eaters. They've always been after Harry in the original series, so in this fanfiction, they might be hot on his trail again, forcing him to seek refuge in the power station.
Maybe in this fanfic, Harry discovers a prophecy that is related to her gender. To avoid fulfilling a part of it that could lead to disaster, she hides her gender. In the process, she could form new alliances with female students who are more in tune with her new 'female identity'. She might also face challenges in classes like Defense Against the Dark Arts because the teaching methods are sometimes more tailored to male students in the original Hogwarts setup.
The plot could be that fem Harry Potter is a secret Power Ranger fan in the wizarding world. One day, a strange magical event causes a rift between the two worlds and some Power Rangers end up in Hogwarts. Fem Harry Potter then reveals her knowledge and love for the Power Rangers. She helps them navigate the wizarding world while also learning from them how to be a Power Ranger. Eventually, they find out that there is an evil force that wants to destroy both the wizarding world and the world of the Power Rangers. So, they train together, combining magic and Ranger powers, and go on a quest to defeat this evil force.
One possible plot could be that the Ghost Rider's power somehow gets intertwined with the wizarding world of Harry Potter. Maybe the Ghost Rider's hellfire has an effect on dark magic, either nullifying it or causing some sort of unexpected reaction among the dark wizards. For example, Voldemort's Death Eaters might be terrified of the Ghost Rider's presence, as his power is so different from anything they've encountered in the wizarding world.
The plot might involve a Muggle - born wizard who discovers that his or her family's power lines have some sort of latent magical property. This discovery attracts the attention of both the Ministry of Magic and some dark forces. Harry Potter gets involved to protect the Muggle - born and their family. Along the way, they learn that the power lines were somehow enchanted long ago, and they have to figure out how to either remove the enchantment or use it for good, all while fending off the attacks of the dark forces.
Perhaps in this fanfiction, Harry hides behind a mask because he wants to experience life in a different way. He might be tired of all the expectations that come with being Harry Potter. By wearing the mask, he can interact with people without them knowing who he really is, and he could discover new things about the wizarding society and its inhabitants. He could also be using the mask as a form of self - discovery, to find out who he is when he's not 'Harry Potter'.
Well, he could encounter some dark artifacts that have a strange pull on him. Maybe he stumbles upon a cursed object that starts to influence his thoughts in a negative way. Since Knockturn Alley is full of dodgy characters, he might also be recognized by some Death Eaters in hiding, which would put him in great danger.
Well, it could be about a new dark wizard emerging in the wizarding world and the new generation of Hogwarts students having to rise to the challenge, much like Harry and his friends did before. Maybe they discover a new kind of magic that is related to this power's awakening.
Well, one possible plot could be that Harry hides his power to protect his friends from dark wizards who might target them if they knew how powerful he really was. Another could be that he hides his power to secretly investigate a mystery within Hogwarts without drawing attention.
Obviously, Harry Potter is the main character as it's about him hiding his power. His friends, like Hermione Granger and Ron Weasley, are also likely to be main characters. They might be in the dark about his hidden power at first, which could create some interesting dynamics in their relationships.