In some fanfictions, if Harry doesn't defeat Voldemort through violence but rather through peaceful means like negotiation or magic - sharing, the theme of 'power through love and sacrifice' can change to 'power through understanding and unity'.
If an alternate ending has the wizarding world merge with the Muggle world, the theme of secrecy and separation in the original series is completely overturned. It might then focus on themes of acceptance and integration. Also, if the concept of pure - blood and half - blood supremacy is reversed in a fanfiction, the original theme of discrimination and the fight against it can change to a theme of equality from the start, with no need for a big battle to prove it.
In the case of 'Snow White', the original has a message about good triumphing over evil. But an alternate ending where the queen reforms herself and Snow White forgives her changes the message. It now emphasizes the power of forgiveness and redemption. It makes the story less about a simple battle between good and evil and more about the possibility of change and growth in people, even those who seem irredeemable at first.
They add new elements. For example, new types of magical flowers can expand the flora of the wizarding world. It gives more depth to the already rich environment of Hogwarts and the places around it.
If the alternate ending is more positive, like the characters achieving victory over the bad guys, it can change the message from one of despair in the face of overwhelming odds to one of hope and the power of unity. It shows that even in the darkest of times, people can come together and make a difference.
In the case of a new time - controlling hero emerging, it would introduce a whole new element to the story. The story would no longer be just about the existing heroes and Timetagger. It would expand the Miraculous universe by showing that there are other powerful forces out there. The new hero could bring new powers, new rules, and new storylines that could potentially lead to spin - offs or new arcs in the Miraculous franchise.
If the alternate ending is more positive, like Carrie using her powers for good, it can change the message from one of despair and the consequences of bullying to one of hope and redemption. It shows that even those who have been deeply wronged can rise above it and use their 'curse' as a 'blessing'.
If the Phantom is accepted by the public in an alternate ending, it would change the message to be about acceptance and the ability of society to look past physical differences. It would suggest that talent and a good heart can overcome prejudice, and that everyone has the potential to be part of a community if given the chance.
They usually change the story by removing Harry as the central figure. For instance, the balance of power at Hogwarts may shift. Without Harry, the Gryffindors might not have that one hero to look up to. And Voldemort's reign could be much more dominant. Also, characters like Neville often become more important as they may be the ones to take on the fight against the Dark Lord.
Dragon familiars often bring a sense of mystery and adventure to 'Harry Potter' fanfictions. They can lead the characters to new and unexplored places in the wizarding world. Their unique abilities, like breathing fire or having great strength, can turn the tide in battles. Also, the bond between the wizard and the dragon can be a central theme, making the story more about friendship and loyalty rather than just magic and power. In some cases, a dragon familiar can even change the social status of a character in the wizarding community, as they are rare and highly respected creatures.
These fanfictions often break the mold of the monogamous relationships in the original story. Consider a scenario where the Marauders are in a polyamorous relationship. This would have a huge impact on how their story unfolds. Their loyalty and camaraderie would take on a different meaning when combined with romantic love for multiple partners. It could also change the way we view their interactions with other characters like Lily. The story would then be more about navigating multiple relationships, dealing with jealousy (if any), and creating a new kind of family or group dynamic that is very different from what we see in the original Harry Potter series.
If Harry has different parents, the plot can change significantly. For example, if his parents are powerful Dark wizards, his upbringing and values would be different. He might not have the same sense of good and evil as in the original. His relationships at Hogwarts would also be different. Instead of being friends with Ron and Hermione who come from 'good' wizarding families, he might be drawn to other students with a darker inclination.