In the 'harry shows his power fanfic', perhaps it's a story where Harry has to show his power in a wizarding competition. He might use his unique abilities like Parseltongue to outwit his opponents and prove his worth. He could also draw on his connection with the Patronus charm to protect himself and others during the tasks.
In this fanfic, Harry is the main character. However, we could also expect to see Dumbledore making an appearance. Dumbledore has always been a guiding figure for Harry, and in a story about Harry showing his power, Dumbledore might offer some wisdom or crucial information. Neville could also be a key character. He has his own growth in the original series, and in this fanfic, he could be inspired by Harry's power and contribute to the overall plot in some way.
Well, Naruto could show Boruto his Sage Mode power. Sage Mode gives Naruto enhanced strength, speed, and the ability to sense chakra more acutely. It's a very powerful form that Naruto has mastered over time. By revealing it to Boruto, he might be teaching Boruto about the different levels of power and the hard work required to achieve such power.
In the 'harry shows his slytherin side fanfic', it could be that Harry is influenced by Slytherin - related magic or a Slytherin - minded character. So he begins to value power and status more, and his actions become more devious. For example, he might manipulate situations to his advantage in a way that is more typical of Slytherin students. He may also form alliances with characters who have Slytherin - like qualities and distance himself from his Gryffindor friends.
Perhaps the fanfic focuses on Harry's emotional journey as he unleashes his power. He could start off being afraid of this newfound strength, but then learns to embrace it. He might face some internal struggles, like whether using his power is the right thing to do, especially if it has some unforeseen consequences.
Obviously, Harry Potter himself would be a central character. His friends like Hermione and Ron would most likely be there too. They could play a role in helping Harry understand and control his power, or they might be in danger and Harry's unleashed power is what saves them.
There are fanfictions where Naruto's power is shown through his ability to connect with the spirits of past Hokages. With their combined wisdom and his own strength, he's able to perform a super - powerful jutsu that not only protects Konoha but also restores the balance of the ninja world. He uses this new - found power to face an ancient evil that has been awakened.
In this fanfic, Harry's character development could be triggered by interactions with Slytherin characters. Their way of thinking and acting rubs off on him. He gradually becomes more ambitious and less impulsive. For example, when facing challenges, he no longer charges in head - first but instead thinks about the long - term benefits and consequences, just like a Slytherin would. His appearance might also change subtly to reflect this internal shift, perhaps his eyes taking on a more calculating glint.
Well, he may show his power by having an innate ability to understand and manipulate magic in ways that are beyond normal wizards. For example, he could be able to sense magic in objects or people in a much more detailed way, allowing him to uncover hidden secrets or foresee danger. He might also have a unique connection to some ancient and powerful magic source that gives him an edge in any magical encounter.