One interesting scenario could be Harry using his space - control ability to instantly transport himself and his friends to hidden, safe places during the Death Eater attacks. For example, he could open a spatial portal to a secret forest glade where they can set up a temporary base. Another could be using time control to go back and prevent certain tragedies, like Sirius's death. He might be able to freeze time right before Bellatrix casts the fatal spell and save Sirius.
In some fanfictions of 'Harry Potter can control space and time', he might use space control to connect different wizarding schools. He could create a bridge in space that allows students from Hogwarts to visit Beauxbatons or Durmstrang easily. Regarding time control, Harry could go back in time to learn advanced magic from the founders of Hogwarts. He could study under Salazar Slytherin for a while and then bring back that knowledge to the present to defeat Voldemort more effectively.
One interesting scenario is Harry going back to the time when the Marauders were at Hogwarts. He could interact with his father and his friends, and maybe even learn some new spells from them. Another could be him going forward in time to see what the wizarding world becomes in the future, and then coming back to make changes in the present to avoid a bad future. Also, he might use time control to relive important moments in his life and gain a new perspective on them, like the Triwizard Tournament.
Well, in such a fanfiction, he might control space through his magic wand. Maybe he uses a special spell that he discovers or invents, which allows him to manipulate the fabric of space, like creating portals or warping distances.
In some Harry Potter fanfictions, time - control can be used to fix past mistakes. For example, a character might go back in time to prevent the death of a loved one. It could also be used to gain an advantage in the fight against Voldemort, like getting more time to study powerful spells or gather allies.
Often, Voldemort remains the main antagonist. Even if Harry can control space and time, Voldemort's thirst for power and his army of Death Eaters are still major threats. He might try to find ways to counter Harry's new abilities or use them for his own evil purposes. For example, he could try to capture Harry and force him to use his space - time abilities to open portals to places where more dark magic items are hidden.
A scenario could be that Lily travels back to her Hogwarts days and tries to change the way she treated Snape. This could have a huge impact on Snape's future actions and loyalties. Maybe she could have been more understanding of his difficult situation, which might have led to him not being so easily swayed by the Dark Arts.
One interesting scenario could be shopping for magical pets in Diagon Alley. In some fanfictions, characters might discover rare and unique creatures that are not typically found in the original books. For example, a magical hybrid of a phoenix and a cat that can both fly and purr.
Well, there are dueling scenarios where characters from different generations meet in a magical duel. For example, a character from Harry's time might accidentally travel back and duel with a student from the Marauders' era. This can lead to some really creative uses of magic as they try to outwit each other with different spells and strategies they've learned in their respective times.
One interesting scenario could be an OC who is a muggle - born wizard but has unique magical abilities not seen in regular wizards. For example, they might be able to communicate with magical creatures in a way that no one else can.
A common boggart scenario in fanfiction is related to the characters' insecurities. For Harry, it could be that the boggart shows him as the cause of all his friends' misfortunes, emphasizing his fear of being a burden or a danger to those he loves. This can add more depth to his character and explore his self - doubts further.
One interesting scenario could be when the characters are in detention and they discover a hidden magical object. For example, in some fanfictions, Harry and his friends might find an old, enchanted diary during detention in the castle. This diary could hold secrets or be a portal to another time or place.