Draco Malfoy could also show up. Given the complex relationships that developed during the war, his presence could add a lot of drama. He might be trying to redeem himself, and his interactions with Harry and Daphne could be really interesting. They could either become reluctant allies or still have some friction between them.
Hermione would probably be in it. Since she's Harry's best friend, she might offer her intelligence and advice to Harry and Daphne in their post - war endeavors. Maybe she helps them with research or legal matters if they're trying to change things in the wizarding world.
Hermione could be involved. She might suspect Daphne of having ulterior motives regarding Harry and try to warn him, which could play into the betrayal storyline in some way, either as a catalyst or as someone who helps Harry deal with the betrayal later.
The two of them could also interact with the Ministry of Magic officials. Harry, being a hero of the war, would have a certain influence. He might try to push for reforms in the Ministry, and Daphne could support him. They would have to deal with bureaucrats who may not be as eager for change, like some of the old - guard pure - bloods who still hold positions of power in the Ministry.
Some fanfictions might include Luna Lovegood. Her unique personality and magical insights could add an interesting dimension to the harem. She could be the one who brings a sense of calm and otherworldly wisdom to the group.
A magical creature could also be an important character. Imagine a friendly house - elf that they meet. The house - elf could be in some sort of trouble, and Harry and Daphne decide to help it. This adventure with the house - elf could shape their relationship and also introduce them to different aspects of the magical world.
Another plot could be that they get involved in the political side of the post - war wizarding world. Harry, being a war hero, has a certain influence, and Daphne, coming from an old wizarding family, has her own connections. They could try to reform the Ministry of Magic, fighting against the old prejudices and corruption that might still linger after the war.
Daphne could be a shy and artistic girl. She might be into painting or writing, and she sees Harry as this source of inspiration. Maybe she first noticed Harry in an art gallery or a library, and that's when the crush started.
Snape could also be a character in such a fanfic. His complex relationship with both Harry and Voldemort makes him an interesting addition. He might be in a difficult position, having to keep his cover as a double - agent while also trying to find a way to save Harry without revealing his true intentions to Voldemort.
In this fanfic, Harry would likely grow in his social skills. Since Daphne has different social circles, he'd be introduced to new people and ways of interacting. He might become more diplomatic, learning from Daphne how to handle different personalities gracefully. Daphne would develop a stronger sense of loyalty. As she gets to know Harry better, she'd see his unwavering loyalty to his friends and causes, and this would inspire her. She might also become more adventurous, as Harry often gets into exciting (and sometimes dangerous) situations, and she'd be drawn into them, expanding her own boundaries.
The main characters are obviously Harry Potter and Daphne Greengrass. Harry is the famous Boy - Who - Lived, known for his courage and his role in the fight against Voldemort. Daphne Greengrass is a Slytherin student at Hogwarts. In the context of GOF fanfic, she often gets involved with Harry in various ways, be it through the events of the Triwizard Tournament or other happenings around Hogwarts during that year.
Theodore Nott could be another main character. He might be a friend of Daphne or her future husband. In the fanfiction, he could be involved in the events leading up to the marriage, like helping with the preparations or being part of a sub - plot where he has his own feelings or motives regarding the marriage. Additionally, Luna Lovegood could make an appearance, adding her unique perspective to the story and perhaps being a friend to Daphne during this important time.