The development of the characters can be really interesting. Danny might struggle with the new relationships and the presence of the succubus. He could be shown to have different facets of his personality come out, like a more protective side. The succubus could start off as a somewhat one - dimensional seductress but then be shown to have a complex backstory and motives. The other members of the harem could also have their own arcs. For instance, one might be trying to find their place in the group, while another could be dealing with past traumas that are healed through the new relationships in the harem.
One idea could be that Danny Phantom, while dealing with his normal ghost - fighting duties, attracts a succubus who then creates a harem of various characters from his world. Maybe they all have to work together to fight off a greater evil that is attracted to the combined energy of the harem.
Danny's character might be developed by showing his vulnerability when it comes to his feelings for Sam. He may become more introspective and less impulsive. For Sam, her character could be developed as she becomes more open about her emotions. She might start to let down her tough - girl exterior a bit more around Danny.
Danny himself is obviously a common character as the center of the harem. Sam and Tucker are often included as well, with Sam sometimes being part of the harem or at least a key figure in Danny's life in the fanfiction. There are also various female ghost characters like Ember or Kitty who are frequently added to the harem due to their interactions with Danny in the original show.
Well, for the Danny Phantom side, Sam and Tucker could be involved. Sam might be jealous at first when other girls start showing interest in Danny. Tucker could be the one giving Danny advice on how to handle the harem situation. From other shows, if it's a crossover with a magical girl anime, characters like Sailor Moon could be part of the harem. Her kind and powerful nature would make an interesting dynamic with Danny. Another could be Kim Possible. She's a strong and capable girl who would likely be intrigued by Danny's powers and get involved in his adventures, and potentially develop feelings for him.
Obviously Danny Phantom himself is a central character. Then, Sam and Tucker often appear as his friends who might have to deal with the whole harem situation. Among the ghostly harem members, characters like Ember McLain are quite common. She has her own charm and powers which make her an interesting addition to the harem concept in fanfiction.
To write a 'Reader x Danny Phantom Harem' fanfiction, start by brainstorming ideas for the harem members. Decide who will be in the harem and what their relationships with Danny and the reader will be like. You can draw inspiration from the original show. Then, think about the setting. Amity Park is full of opportunities for interesting scenarios. When it comes to the reader character, make them relatable. Maybe they're a new student in town or a transfer ghost hunter. As for the plot, it could be a slow - burn romance where the reader gradually gets closer to each member of the harem. Include some emotional moments, like misunderstandings and reconciliations, to keep the story engaging.
Yes, there are some interesting ones out there. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'danny phantom ghostly harem' and you'll find a variety of stories with different takes on the concept.
Their relationship could develop realistically through shared experiences. For example, if they both face a situation where they are outcast by the human and ghost worlds alike. This would make them rely on each other for support, slowly building a connection.
Obviously, the main character would be Danny Phantom himself, but in two different forms or versions. One would be the original Danny Phantom from the canon source, and the other would be a version created by the fanfiction. There might also be his friends like Sam and Tucker who could play important roles in helping the two Dannys understand each other and deal with any issues that arise from their meeting.
Sam is also quite popular. Her goth - like personality and her strong - willed nature make her an interesting character. In fanfiction, she can be portrayed in different ways, like being even more involved in Danny's ghost - fighting activities.