Well, in some fanfictions, Harry discovers he can control the elements as a result of some ancient magic. He then uses this power to create new spells. He might combine fire and air to make a super - hot blast of wind that can melt metal doors in a dungeon where a dangerous creature is locked. Or he could use water to form ice bridges across a dangerous chasm in the Forbidden Forest.
In this type of fanfiction, a great plotline could be that Harry's control over the elements is linked to his emotions. So when he's angry, fire blazes out of his hands uncontrollably. He has to learn to master his emotions to fully control the elements. This could lead to a story where he has to face his inner demons while also dealing with external threats that require his element - controlling abilities. For instance, he may be facing a group of dementors, and he has to calm his anger to use water element to create a protective mist around himself and his friends.
Well, in some fanfictions, Harry might control the Dursleys by making them understand the wizarding world. He could show them magical things and, as a result, they start to respect him and his abilities. This could lead to a whole new dynamic in the household, where the Dursleys are no longer mean but rather in awe of Harry and his magic.
A possible plotline is that Harry accidentally discovers the time - controlling power while exploring an old, forgotten part of the Hogwarts library. He then has to figure out how to use it without disrupting the fabric of time too much.
A possible plotline could be that Harry's fire - controlling power is seen as a threat by the Ministry of Magic. They try to suppress it, thinking it's dark magic. Harry then has to fight against the Ministry's unjust rules to prove that his power can be used for good, like helping to fight against the remaining Death Eaters.
One interesting concept could be how Harry Potter might use his newfound ability to control reality to change the outcome of major events in the wizarding world, like preventing certain deaths. For example, he could bring back Sirius Black. Another concept might be how it affects the power balance among the different wizarding factions.
One possible plotline could be Kaguya using her powers to manipulate Naruto into fighting his friends. She might twist his perception of right and wrong, creating chaos in the ninja world. Another could be Kaguya trying to use Naruto as a vessel to regain her full power and reshape the world according to her will.
One interesting plotline could be Izuku using his reality - controlling powers to create a world where everyone has equal opportunities in the hero world, regardless of their quirks or background. He might rewrite the rules of hero society to make it more inclusive and fair.
One possible plotline could be Naruto using his newfound control over silver to create unique jutsu. Maybe he can shape silver into weapons or shields in the heat of battle, giving him an edge against his foes.
Obviously, Harry Potter is the main character as the title implies. He's the one with the power to control the elements. Hermione Granger and Ron Weasley would also likely be important characters. Hermione could be helping Harry research about the origin of his element - controlling ability, and Ron would be by his side in his adventures, providing support and some comic relief.
Another plotline could involve the amulet having the power to travel through time. Harry uses it to go back in time to learn more about Voldemort's past, in order to find a weakness. This would be a very exciting and complex story, as he would have to be careful not to change the present too much while in the past.
One interesting plotline could be the emancipation of house - elves in a more radical way. Maybe a group of wizards and witches, inspired by Hermione's SPEW, take more forceful actions to give house - elves full rights and freedom, which could lead to a lot of conflicts with the traditional pure - blood families who are used to having house - elves serve them.