I'm not entirely sure as it depends on the specific fanfiction community. But perhaps there are two main protagonists who are often the center of the love stories, like a charming young man and an intelligent young woman.
The main character is Naruto, no doubt. However, in a 'naruto of the whirlpool fanfiction', there could be antagonists who are also key characters. These could be villains who are after the power of the Uzumaki clan. There might also be side characters like a sensei from the Whirlpool Village who trains Naruto in some unique Uzumaki - related techniques. These characters all contribute to the overall narrative of the fanfiction, whether by helping or hindering Naruto's progress.
In this type of fanfiction, Naruto is a given as a main character. He is the one who gets involved with the story of the Princess of Whirlpool. The princess herself is a major character, with her own backstory, abilities, and goals. Then there could be characters from the Whirlpool Country, like her guards or advisers. These characters help to flesh out the world of the fanfiction and add more depth to the story.
Well, obviously, the 'Naruto prince of whirlpool' is one of the main characters. There might also be his friends and allies from the original Naruto series, like Sasuke or Sakura, who could play important roles in his journey related to his Whirlpool identity.
Obviously, the girl from the whirlpool is the main character. There may also be a mentor figure, like an old wise person who has some knowledge about the whirlpool and can guide the girl on her journey.
Naruto's family members would be important characters. His father Minato might appear in flashbacks to give some clues about the Whirlpool inheritance. Hinata could also be part of the story, perhaps as Naruto's support system. And don't forget about the villains. There could be antagonists who want to use Naruto's new status as the heir to the Whirlpool for their own evil purposes, like Orochimaru or some new, unknown enemy.
Obviously Naruto would be one of the main characters. There might also be characters from the Whirlpool like Karin, as she has connections to that place.
One popular pairing could be Naruto and Sasuke. Their complex relationship in the original series can be explored further in a yaoi context, with fans delving into their unspoken feelings and the potential for a more romantic relationship.
In Naruto fanfiction, 'Whirlpool of Love' could refer to a story that focuses on the complex relationships within the Naruto universe. It might involve romantic relationships between characters, perhaps with a focus on the Uzumaki clan, as 'whirlpool' is associated with them. It could be a story exploring the deep emotional connections and loves that develop in the midst of the action - filled Naruto world.
Since the content of this fanfic is unknown to me, the main characters could be anyone. It might be a story centered around a heroic character who is unjustly chained to the whirlpool by an evil force. Or it could be a story about a group of characters where one of them gets caught in the whirlpool situation and the others have to work together to save them. There could also be a love interest character who plays a crucial role in the story, either by being a motivation for the chained character to break free or by actively participating in the rescue.
One possible main character could be a young ninja from the Whirlpool village who has a special ability related to water manipulation. Another could be a Sand village ninja known for their skill in sand - based jutsu.