I think Professor Flitwick could be an interesting choice. He is small in stature but big in magic. He could use his charm and levitation spells to create some unique dance effects. For example, he could make the students levitate slightly while dancing to give an ethereal look. His knowledge of charms could also be used to add some fun elements to the dance class, like making the dance floor sparkle or creating musical accompaniment with magic.
Well, a plot twist could be that the dance instructor is actually a disguised Death Eater. They start using the dance class as a cover to pass on secret messages or to plant some sort of dark magic object. Maybe they try to manipulate the students' movements in the dance to form some sort of dark symbol. Another interesting plot twist could be that the magic used in the dance class goes haywire. Instead of normal dance moves, the students start floating uncontrollably or their feet move on their own in a chaotic way, leading to a lot of comical and dangerous situations.
Neville Longbottom could be really interesting. He's usually so shy and awkward, but at the Yule Ball, he could have a moment of confidence. Maybe he asks a girl who no one expected him to ask, or he could show off some hidden dancing skills. Another option is Luna Lovegood. She might wear a really unique and eccentric dress to the ball, and her strange but endearing personality could make for some great interactions during the event.
In many fanfictions, Harry Potter is depicted as learning or already knowing how to dance at the Yule Ball. It depends on the creativity of the author.
The most interesting part could be their first dance. Harry, who is used to being in the spotlight for more dangerous reasons, now has all eyes on him in a different way at the ball. And Luna, with her dreamy and free - spirited nature, might lead him in a dance that's full of unexpected twirls and steps. It would be a contrast to the more formal and traditional dances that others are doing.
Tonks would probably be more likely to initiate. She's a confident and spontaneous person. She might see Harry looking a bit lost or out of place at the Yule Ball and just grab his hand to drag him onto the dance floor, not caring about any propriety or formalities.
There's also a possibility that it's a new character created specifically for this fanfiction. This new character could bring a fresh perspective and allow the author to explore different aspects of Harry's gentlemanly behavior at the Yule Ball.
One interesting storyline could be about a character who was initially too shy to ask someone to the Yule Ball but finally gathers the courage at the last minute. Maybe a Hufflepuff student who has a crush on a Ravenclaw but is afraid of rejection. They spend the weeks leading up to the ball trying to find ways to talk to the Ravenclaw and in the end, they have a magical night at the ball.
Perhaps there are some misunderstandings at the start. Fleur might think Harry is just another typical Hogwarts boy, but as the ball progresses, she sees his courage when he stands up to a bully or helps someone in need. Harry, on the other hand, realizes that Fleur is not just a beautiful face but also a strong and intelligent witch. This realization on both sides could lead to a more meaningful relationship development.
In some fanfictions, the Yule Ball is a turning point for Harry and Daphne's relationship. For example, Daphne might be a bit of an outcast in her own Slytherin house for being different. When she goes to the ball with Harry, they face a lot of stares. But they don't let it bother them and instead have a great time, chatting about magic, Hogwarts secrets, and their dreams for the future. This could be the start of a beautiful friendship or something more.
Well, a plot could involve a character who is an outcast getting a magical makeover just for the Yule Ball. They enter the ballroom and everyone is shocked. Or perhaps there's a mystery at the Yule Ball. A valuable magical item goes missing during the event, and the main characters have to solve the mystery before the night ends. It could also be about two rivals who end up having to dance together at the Yule Ball and discover they have more in common than they thought.