A power - hungry wizard within the Ministry itself could be the antagonist. He sees Amelia Bones as a threat to his rise in power and also dislikes Harry for his influence among the wizarding community. He spreads false rumors about them and tries to get them in trouble, all while trying to further his own political agenda.
Maybe an ancient dark magic entity that has been awakened. It doesn't want Harry and Amelia Bones to succeed in their mission of bringing peace and order to the wizarding world. So, it uses its dark powers to possess people around them, causing chaos and making it difficult for Harry and Amelia to trust anyone as they work towards their goals.
It could be a dark wizard who has infiltrated the Ministry of Magic. This antagonist might be trying to undermine Amelia Bones' work and also target Harry for his fame and power.
There could be a group of dark wizards who are working together to bring chaos to the wizarding world. They target Amelia Bones because of her position in the Ministry and Harry Potter because of his fame. This group, with their evil intentions and powerful dark magic, would serve as the main antagonists in the fanfiction.
Perhaps a new dark wizard or witch who is jealous of Amelia Bones' power and influence in the Ministry. They might see Harry as a way to get to Bones, by either using him as a pawn or by trying to turn him against her. This new antagonist could have a unique and dangerous brand of dark magic that challenges both Harry and Amelia.
One possibility is that they meet during a Ministry event. Harry is there because of his status as the 'Boy Who Lived' and Amelia Bones is representing the Department of Magical Law Enforcement. They strike up a conversation about the future of the wizarding world and how to better protect it from the remnants of Voldemort's followers.
Well, it could be about Harry Potter seeking Amelia Bones' help in solving a mystery within the wizarding world. Maybe a new dark magic threat has emerged, and Amelia Bones, with her expertise in the Ministry of Magic's law enforcement, teams up with Harry to get to the bottom of it.
It could be a rogue wizard who has infiltrated Hogwarts. They might be trying to steal powerful magical artifacts or knowledge from the school.
The obvious antagonists would be the Death Eaters. They are always up for causing chaos and harm. If Voldemort has a particular interest in Amelia Bones, perhaps because of her knowledge or position in the wizarding world, he would send his loyal Death Eaters to capture her. Another possibility could be some rogue dark wizards who are trying to gain power and see Amelia as an obstacle.
It could be some of the remaining Death Eaters. They might target Amelia Bones because she is a powerful and important figure in the Ministry of Magic. Her knowledge and influence could be a threat to their plans of resurrecting Voldemort's ideology or causing more chaos in the wizarding world.
There isn't really one 'best' author as different readers have different tastes. However, some authors who have a large following for their 'Harry Potter' fanfictions might also do a great job with Amelia Bones. They usually have a good understanding of the overall 'Harry Potter' universe and can integrate Amelia Bones into the story in a seamless way. You might want to look for authors who have received a lot of positive reviews for their stories involving similar themes or characters.
Amelia Bones is a high - ranking official in the Ministry. She is part of the wizarding establishment that Harry Potter often has to interact with. Her role could be crucial in times of upheaval, like during the return of Voldemort. She might offer her expertise or resources to Harry and his friends in their fight against the Dark Lord.