In the fanfiction world, there could be some sort of cosmic or spiritual balance at play. Saving Kagome might disrupt this balance, and Toga could be faced with having to deal with the consequences of that. For example, he might have to face some sort of trial or ordeal to restore the balance.
Toga could gain the loyalty of Kagome and her friends. By saving Kagome, he has done them a great favor. So, they might be willing to help him in his future endeavors or protect him if he is in danger.
He might face retaliation from Kikyo. Since Kikyo was intent on killing Kagome, Toga's interference would surely make her angry, and she could try to harm Toga in return.
Maybe Toga uses his powerful abilities. He could have some special powers like super strength or the ability to manipulate time or space. With these, he might be able to stop Kikyo from harming Kagome.
One consequence could be that he gains an unexpected ally in Draco. Draco might feel indebted to Harry and start to change his views towards him, which could lead to some interesting interactions between them in the future. This could also cause some tension among their respective groups of friends.
She might face some magical backlash. Saving someone from the veil could be against the natural laws of magic in the fanfiction world, so she could experience some physical or mental exhaustion as a result.
One consequence could be that Bellatrix becomes enraged and sets out to hunt Fred down. This would put Fred in constant danger as Bellatrix is a very powerful and vengeful witch.
Some fanfictions might depict that the wizarding community might see her as a hero. However, others could show that she faces backlash from some conservative wizards who think she overstepped her bounds. They might try to isolate her at Hogwarts or spread rumors about her. But her friends like Harry, Ron and Hermione would surely support her through it all.
She might face suspicion from her friends. Since Thorfinn Rowle could be associated with the dark side, her friends might not understand why she saved him. They could question her judgment and worry that she was getting involved in something dangerous or morally ambiguous.
One consequence could be that Artemis becomes indebted to Percy. This might lead to her providing him with special favors or assistance in his future adventures. For example, she could offer her hunters to help Percy in a battle.
He might face opposition from his own pure - blood community. Since Hermione is a Muggle - born, saving her could be seen as going against their traditional values. So he could be ostracized or face threats from some of the more extreme pure - blood families.
One interpretation could be a reconciliation. Since they are often at odds in the original story, a kiss could symbolize the end of their feud and the beginning of a new relationship, whether it's a friendship or something more complex. It could be seen as a way to heal the rift between them.
Another theme is self - discovery. As they interact more closely in fanfictions, both kikyo and kagome often learn more about themselves. They might discover new aspects of their powers or their personalities through their relationship with each other.