Well, Harry Potter himself is surely one of the main characters as the title implies he has the power to control time. Hermione Granger is likely to be another main character. She is always by Harry's side in the original series and would be there to help him understand and manage his new time - controlling ability, perhaps with her vast knowledge and logical thinking.
Another plot might involve Harry exploring different timelines. He could find a timeline where Voldemort never existed and see how the wizarding world developed without the Dark Lord. This would give him insights into the true nature of good and evil and how much Voldemort really influenced the world.
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.
I'm not entirely sure specifically what 'harry controls ice fanfiction' is about without reading it. But it could potentially be a fan - created story where Harry has the ability to control ice in a fictional universe related to the Harry Potter world or some other fictional setting.
Well, it could be about a fan - created story where Harry has the ability to control blood. Maybe it involves some sort of magic related to blood manipulation that is unique to this fanfiction's concept.
It could be about Harry having the ability to control shadows in a fictional story. Maybe he uses this power for various purposes like solving mysteries or protecting his friends.
One way could be that Harry discovers an ancient spell or artifact that gives him the power to control space - time. For example, he might use it to go back in time to prevent certain tragedies from happening in the wizarding world, like the death of his parents. He could also use it to jump to different locations instantly, bypassing normal apparition limits.
If Harry uses his space - time control abilities in the fanfiction, he might accidentally create alternate timelines. For example, if he saves a character who was supposed to die, that character could then go on to make different choices that change the entire course of events. This could lead to a situation where the world he knew is no longer the same, and he has to deal with the chaos of these new timelines.
In fanfiction, if Harry Potter controls the dead, it could completely change the power dynamics in the wizarding world. It might give him an edge in battles, as he could summon the knowledge and skills of the deceased. For example, he could get strategic advice from great wizards of the past. However, it also raises moral questions. Is it right to use the dead in such a way? It goes against the natural order in the original Potter universe.