Who could be the main antagonist in Peter Pan and Emma fanfiction?

Captain Hook would be an obvious choice. His hatred for Peter Pan could extend to Moira when she becomes Peter's friend. He might see her as another obstacle in his quest to get revenge on Peter.

It could be a new character. Maybe a dark sorcerer who has come to Neverland while Peter was growing up. This sorcerer wants to take over Neverland and sees Peter, with his new adult understanding and power, as the only obstacle. The sorcerer could start to corrupt the island, turning the mermaids and Lost Boys against Peter, making him fight not only for his place in Neverland but also for the very soul of the island.

Perhaps an older, forgotten enemy of the Lost Boys could resurface. Maybe someone from their past in Neverland who they thought was defeated but has now returned with a vengeance. This could be a character who was once a Lost Boy himself but turned bad due to some dark influence in Neverland.

Perhaps a new student named Tiger Lily. She comes to the high school and has her own set of rules and ideas. She wants to take over Peter's group of friends and tries to drive a wedge between Peter and Wendy. She's very competitive and sees Wendy as an obstacle to getting closer to Peter.

The mermaids could be the main antagonists. They are known to be jealous and territorial in the Peter Pan stories. If the lost girl catches Peter Pan's attention in a way they don't like, they could make her life in Neverland miserable. They might use their alluring voices and their knowledge of the waters around Neverland to try and drive her away or lead her into danger.

The Evil Queen could be a great antagonist. She might see the relationship between Emma and Rumpelstiltskin as a threat to her power. She could try to drive them apart by creating misunderstandings and false scenarios that make them doubt each other.

Captain Hook would be a likely main antagonist. He has a long - standing feud with Peter Pan, so he would see Peter Pan's daughter as a target or a way to get revenge on Peter. He might try to capture her or use her to lure Peter Pan out of hiding if he's still alive in the fanfiction's version.

It could be the previous Dark One who doesn't want to give up their power completely. Even though Emma has become the new Dark One, the old one might try to manipulate her from the shadows, trying to get her to make mistakes that would allow them to regain their power.

Perhaps a corrupted version of one of Peter's friends from another dimension within subspace could be the antagonist. This friend has been twisted by the strange energies of subspace and now wants to use Peter to gain access to the normal world to cause chaos.

It could be someone from Stark Industries who doesn't like the idea of Peter inheriting something. Maybe a rival within the company who sees Peter as an inexperienced kid and wants to take whatever Tony left for Peter for themselves.