Well, it could start with Hermione being in a vulnerable situation, like being cornered by the troll in a dark, damp dungeon. Harry, being the brave hero, arrives just in time. He might first distract the troll by conjuring up some annoying little creatures that the troll would start chasing. Then, when the troll's back is turned, Harry would grab Hermione and apparate them both to a safer place, like the Gryffindor common room.
In this kind of fanfic, one possible scenario could be that Harry uses his quick thinking and magical skills. For example, he might use a stunning spell on the troll just in time to stop it from harming Hermione. Another scenario could be that Harry lures the troll away from Hermione, using his knowledge of the troll's behavior. Maybe he throws something noisy in the opposite direction to draw the troll's attention.
One possible plot twist could be that the troll is actually under the control of a dark wizard. So when Harry saves Hermione, they realize that there is a much bigger threat at hand. Another twist could be that the troll turns out to be a transformed Hogwarts student, and they have to find a way to reverse the spell instead of just fighting it.
One reason could be that the troll is simply on a rampage and Hermione was in the wrong place at the wrong time. Trolls are not known for their intelligence, and it might have just stumbled upon Hermione while wandering the Hogwarts halls.
His courage becomes more evident. By saving Hermione, he shows that he is willing to face great danger for his friend. This act of heroism can make him more confident in his abilities as a wizard.
Well, in many such fanfictions, Harry might use his magic skills. He could cast a powerful stupefy spell on the troll to stop it in its tracks and then quickly lead Hermione to safety. Maybe he also uses his quick thinking and knowledge of the Hogwarts corridors to find a hiding place where the troll can't reach them.
It could show Harry relying on his own inner strength and knowledge. Maybe he discovers a new spell through his own research in the library at Hogwarts, a spell that helps him fend off a powerful dark wizard without the help of his friends. For example, he might find a spell that can create a shield of pure energy that not only blocks dark curses but also reflects them back at the attacker.
It would be a very interesting and unique crossover. Harry Potter's magical world with its spells, wands, and Hogwarts could blend oddly with the Akatsuki's world of ninjas, their unique powers and their mysterious goals. For example, Harry could use his magic to counter some of the Akatsuki's jutsu. Or perhaps a member of the Akatsuki might be interested in the power of the Philosopher's Stone.
Well, it would be a very different kind of relationship. They are both very intelligent and brave, so they would probably have a relationship based on mutual respect for their knowledge and skills. But it would also be complex because they are such good friends already. Maybe it would start with them realizing they have a deeper connection than just friendship during one of their many adventures.
Hermione's dress could be a beautiful deep blue, made of silk that shimmers in the light of the Yule Ball. It might have some delicate lace trimming around the neckline and sleeves, giving it an elegant touch.
Well, it might look like Hogwarts being placed in Westeros. The houses in Hogwarts could interact with the different houses in Game of Thrones. Gryffindors could team up with the Starks, known for their honor. Slytherins might find common ground with the Lannisters, being cunning and power - hungry. And the magic of Harry Potter could be used to change the fates of the characters in Game of Thrones. Maybe Hermione could use her intelligence to outwit Littlefinger, or Ron could befriend some of the knights in Westeros.