Well, if Harry gets rid of Snape, he might face backlash from the Slytherin house. Snape was a Slytherin and had his supporters there. They could make Harry's life difficult in various ways, like spreading rumors or trying to undermine his achievements. On the other hand, Harry might find new allies. Those who were secretly afraid of Snape but couldn't do anything might now side with Harry. But he also has to be careful not to let this new - found power go to his head, or he could end up making more enemies in the long run.
After getting rid of Snape, Harry could be in a tricky situation. The wizarding world outside Hogwarts might take notice. Some might view it as a sign of Harry's growing power and be either afraid or try to use him. At Hogwarts, the balance of power among the teachers could shift. There could be a power vacuum that leads to new problems. Also, Harry might have to deal with his own guilt or second - thoughts. Even if Snape was a difficult person, getting rid of him in such a way might make Harry question his own actions and whether he was really in the right. This internal struggle could affect his performance in school and his relationships with others.
Snape could face some backlash from the Ministry. If they find out that he was involved in getting rid of Umbridge, they might try to find ways to punish him or at least keep a closer eye on him. However, his skills at subterfuge would likely help him avoid any serious consequences.
Harry might become more determined to prove Snape wrong. He's a stubborn character, and Snape's yelling could fuel his desire to show that he's not the misbehaving student Snape seems to think he is.
Maybe if Snape had revealed his true loyalties earlier. Harry would then understand that Snape was on his side all along. This could lead to them getting along as they both fought against Voldemort. Snape's sacrifices for the wizarding world would make Harry respect him.
Perhaps Harry witnesses Snape being extremely unfair to a group of students, like constantly giving them detention for no good reason. Harry decides to take a stand and gathers statements from the students. He then goes to the Hogwarts board of governors and presents his case, leading to Snape's dismissal.
One possible consequence could be that Harry starts to show signs of lycanthropy, like Remus. He might experience the monthly transformation, which would bring a whole new set of challenges for him at Hogwarts. It could also lead to a change in his relationships. His friends might be initially scared or not know how to deal with it, and he might face discrimination from some students who fear his new werewolf nature.
Well, in some fanfictions, Harry getting bitten by Greyback might lead to a whole new set of adventures. He could be on a quest to find a cure, which would involve seeking out rare magical creatures or ancient spells. It could also change his relationships. For example, Hermione might be more protective of him, while some of his other friends could be a bit more hesitant around him because of the danger his new state poses. Also, it could potentially make him a target for those who want to use his new werewolf abilities for their own evil purposes.
Socially, his status as a hero might change. Some might see him as weakened and no longer the invincible hero. This could lead to a shift in the wizarding community's perception of him, and he might have to work hard to regain his former standing.
There could be some negative consequences too. Maybe the dragon had some kind of magical protection or was under the care of a powerful wizard or creature. Harry might then face the wrath of those who were protecting the dragon, leading to him having to go into hiding or facing dangerous challenges. Also, the act of killing a dragon, even in self - defense, might make some more sensitive wizards view him in a different, less favorable light.
One possible consequence is that the wizarding world might see Harry as a hero even more than before. After all, dementors are very dangerous creatures, and if he manages to destroy them, it's a huge accomplishment.
He might gain some extraordinary magical abilities. For example, he could be able to control time or have a deeper understanding of magic spells that were previously difficult for him.