It could be a rival dancer who is jealous of the teen daughter's talent and the support she gets from Sharna. This rival might try to sabotage the daughter's chances at auditions or competitions.
It could be about Sharna Burgess teaching her teen daughter how to dance. Maybe the daughter is initially shy but Sharna encourages her, and they end up bonding over their shared love for dance and perform together at a local event.
A common theme is the love for dance. Since Sharna is a dancer, many fanfictions incorporate dance into the relationship between her and the reader. It could be that they bond over a shared dance style or they teach each other new moves.
One great place to find Sharna Burgess x Reader fanfiction is Archive of Our Own (AO3). There are many well - written stories there that explore different relationships between the character and the reader. Just search for 'Sharna Burgess x Reader' on the site and you'll be presented with a variety of options.
The mother's new partner. He doesn't want the forgotten daughter to be part of the family as he fears she will disrupt the new family dynamic he has been trying to build. He might use various means to keep her away from the family.
A group of rogue demigods could be the main antagonists. They might be jealous of the attention the daughter gets because of her parents. So, they plot to make her life difficult and try to drive a wedge between her and the other demigods.
Maybe an organization that wants to use her unique abilities. If she has inherited some special power from Kakashi or has her own distinct skills, an evil organization could try to capture her and force her to work for them. They would be the main obstacle she has to face in the story.
It could be a powerful vampire from a different coven. Maybe one who sees the daughter of war as a threat to their power or territory in the Twilight world.
It could be a powerful rogue ninja who has a vendetta against Kakashi and sees his daughter as a way to get revenge. This antagonist might try to use her as a bait to lure Kakashi or Naruto into a trap.
Another option is a power - hungry wizard from within the Ministry of Magic. They might see Harry's daughter as a tool to gain more power. They could try to manipulate her or create situations where she is framed for things she didn't do, all in an attempt to control her and use her connection to Harry for their own political gain.
There could also be a group of rogue demigods who oppose the daughter of Artemis. They might be jealous of her powers or her connection to Artemis. They could try to sabotage her and Percy's quests and cause trouble for them at every turn.