If Harry was Voldemort's right - hand man, it would be a major shift in power dynamics. The good wizards would lose a great symbol of hope. Voldemort would have an even stronger hold on the wizarding world. Harry could use his skills to spread fear and propaganda for Voldemort. He could turn friends against each other, like Hermione and Ron. The wizarding community would be divided even more deeply, with some believing that Harry could be redeemed and others seeing him as a lost cause.
The wizarding world would be in chaos. Harry, being Voldemort's right - hand man, would be a huge threat. He knows many of the Order of the Phoenix's secrets. Hogwarts would no longer be a safe haven. The students would be in constant fear as Harry could use his inside knowledge to help Voldemort attack the school. The Ministry of Magic would also be in a difficult position as they had once relied on Harry to be their savior.
The wizarding world would likely be plunged into a state of despair. Harry was seen as the 'Chosen One' to defeat Voldemort, so without him, there would be a sense of hopelessness. Voldemort would probably have free rein to impose his dark rule without much opposition at first.
If Voldemort won the war in fanfiction, the wizarding world would experience a total transformation. First, the Ministry of Magic would be under his complete control. His Death Eaters would be in charge of all the important positions. The concept of justice would be warped, and any form of opposition would be brutally suppressed. The wizarding economy would likely suffer too as Voldemort's focus would be on power and domination rather than development. Also, the relationships between different magical creatures would be disrupted as Voldemort has no respect for any form of life other than his own pure - blood ideology.
There would be a great deal of shock and confusion. Many would start to question everything they had believed in. Families would be divided. Some might think that Harry had been corrupted by Voldemort's dark magic and try to find a way to reverse it. The Ministry of Magic would be in a panic. They would try to come up with new strategies to deal with this new threat. Teachers at Hogwarts would be worried about the safety of their students. And the Death Eaters, while initially happy to have Harry on their side, would also be suspicious of his motives and loyalty.
The wizarding world would be in shock. Hermione would probably be the first to try to rationalize it and look for a way to help Harry deal with this new reality. Ron might be more conflicted, his loyalty to Harry warring with his fear of Voldemort. The Weasley family would be divided in their opinions. Some might still support Harry, while others would be hesitant. Dumbledore's portrait, if it could, would likely offer some cryptic advice. And the Death Eaters? They might see Harry as a potential ally or a threat, depending on how they view Voldemort's paternity.
When Fem Harry joins Voldemort, it completely flips the power balance. The Ministry of Magic, which was already in a tenuous position, would be even more unstable. They would be unsure how to deal with a situation where the once - hero is now on the side of the dark lord. The Hogwarts students would be divided. Some might be inspired by Fem Harry's actions, thinking there's more to the story, while others would be heartbroken. This would also lead to a change in the way magic is perceived. Dark magic might start to seem more appealing to some, and light magic less so, creating a moral gray area in the wizarding world.
One possibility could be that Harry was somehow turned to the dark side early on. Maybe he felt betrayed by Dumbledore or the wizarding world. As Voldemort's right - hand man, he would use his knowledge of Hogwarts and the Order of the Phoenix to undermine their efforts. He might lead attacks on the school and help Voldemort in his search for the remaining Horcruxes.
The Death Eaters would initially be overjoyed. They would think that with Harry on their side, they are invincible. But some of them might also be suspicious of Harry's motives, fearing that he is a double - agent. As for the general wizarding population, they would be terrified. Harry was seen as their hope, and now that he has joined Voldemort, they would feel completely hopeless and defenseless.
The wizarding world would be in chaos. The Order of the Phoenix would be extremely worried and likely try to rescue Harry. The Death Eaters, on the other hand, might see it as a sign of Voldemort's power and dominance. Hogwarts would also be affected, with teachers and students fearing for the future of the wizarding world.
The Order of the Phoenix would be horrified. They have spent so much time and effort fighting against Voldemort. If they found out Harry had asked for his help, they would likely feel betrayed. They might even try to stop Harry, thinking he had been somehow influenced or corrupted.
Their marriage might also change the way different wizarding families interact. Since Harry is famous and Tonks comes from a well - known family, their union could bridge gaps between different social groups in the wizarding world. This could lead to more cooperation in areas like magical research and international relations.