Maybe the prince is from a neighboring magical country. For example, he could be from a place like Beauxbatons or Durmstrang. He comes to Hogwarts on an exchange program of sorts and that's where he meets Harry and decides to court him. This would add an element of international magical relations to the fanfic.
It's possible that the prince is a self - proclaimed prince from a group of outcast wizards. He has his own sense of royalty and is attracted to Harry's underdog - turned - hero story. He might be a bit of a rebel among the wizarding community and his courtship of Harry causes a stir as it challenges the traditional views of the wizarding society.
Well, perhaps the prince could be from a magical realm not yet explored in the original series. He might be drawn to Harry Potter's unique courage and power. The fanfic could involve the prince trying to win Harry's heart with grand magical gestures and adventures that take them to new and mysterious places.
Perhaps it could be a corrupted version of one of the existing characters. For example, a character who has been influenced by dark magic and has turned into this 'prince of darkness'. It could be a Slytherin student who has delved too deep into the forbidden knowledge of the house and has become a dark force. Another possibility is that it's a long - lost relative of a major villain like Voldemort, carrying on his legacy in a new and terrifying way.
It could be an original character created just for this fanfiction. Maybe a prince from a hidden magical realm that has been kept secret from the wizarding world until now.
The main characters would include Harry Potter, who is the experienced wizard. The Prince of Arendelle, who represents the leadership of his kingdom. Then there could be Hermione as well. She could come to Arendelle with Harry and use her intelligence to figure out how the magic in Arendelle works and how it can be combined with the magic they know from Hogwarts. Ron might also tag along and provide some comical relief during their adventures in Arendelle.
It could be an ancient and powerful dark wizard who has been dormant for a long time. Maybe someone from the time before Hogwarts was even founded.
There's no easy way to tell who created it without more context. Fanfic is a vast and decentralized world. It could be a relatively unknown author who just had this creative idea for a Harry Potter - related fanfic. Maybe it was created by someone in a small fanfic community or on a particular fanfic platform.
It could be a new villain that the fanfiction author has introduced. Maybe a long - lost relative of Voldemort who has emerged to continue his dark legacy.
Another potential antagonist could be a jealous rival within Slytherin. This character might be envious of the 'Prince of Slytherin's status and popularity and would stop at nothing to bring him down. This could lead to a lot of internal Slytherin house drama and power struggles in the fanfic.
It could be about Harry being a crown prince in a hidden wizarding kingdom. Maybe he discovers his true heritage and has to deal with the responsibilities that come with being royalty while still facing the threats from Voldemort.
Well, it could be about Harry Potter somehow getting transported to Arendelle. Maybe he uses magic to help the people of Arendelle deal with some new threat that the royal family can't handle on their own. He could use his magic skills, like spells from Hogwarts, to combat an evil force that's trying to take over the kingdom.