It could be Harry, Ron and Hermione. They are the central characters in the Harry Potter series and are likely to be involved in such a fan - created scenario like a poker game.
Perhaps some of the Weasley family members could be main characters. The Weasleys are known for their fun - loving nature, and a poker game seems like something they would enjoy. Fred and George especially might be involved, using their mischievous ways to liven up the game. Also, Draco Malfoy could be a main character to add some conflict to the game, as he has a rivalry with Harry and his friends.
There could be some original characters created by the fanfic author as well. These new characters might bring a fresh perspective to the poker game. They could be from different houses at Hogwarts, each with their own motives and strategies for the game. For example, a Ravenclaw character who uses their intelligence to outwit the others in the poker game, or a Hufflepuff character who plays more for the social aspect and friendship rather than just winning.
It could be about a poker game within the world of Harry Potter. Maybe it involves the characters playing poker for various reasons like making bets related to magical items or secrets.
Harry Potter himself could be one of the main characters. He might be drawn into the poker game by his friends Ron and Hermione, who think it could be a fun way to unwind from their usual magical adventures.
Obviously, Harry Potter himself could be a main character. He might be using his skills of strategy from his adventures to play poker well.
Obviously Naruto himself would be a central figure. He could be the enthusiastic player who always tries to bluff his way through the game. Sasuke might also be there, being the more reserved and calculating player. Sakura could be the one who scolds them both for their reckless betting. Kakashi could be the experienced player who gives out tips and tricks now and then.
It might feature a new character who is an expert in martial arts, like a transfer student from an Asian wizarding school, and they could be a main character along with Harry and his friends. They could bring in new ways of fighting dark magic using their martial arts skills.
I don't know for sure as I haven't read it. But it could be the children of the main characters from Sword Art Online's Aincrad arc and some well - known characters from the Harry Potter series.
It's hard to say without actually reading it. But it could be the usual suspects like Harry, Hermione, and Ron, as they often find themselves in situations full of contradictions in the original series.
There could also be some of the teachers or staff from Hogwarts in the 'breeding grounds hp fanfic'. For example, Hagrid would be a very likely character to be involved, given his love and knowledge of magical creatures. His presence could add a sense of authenticity and guidance in the breeding ground scenarios.
Typically, the main characters in 'hp next gen fanfic' are the children of the original series' main characters. For example, James Sirius Potter, Albus Severus Potter, and Lily Luna Potter, who are Harry and Ginny's children. There are also characters like Scorpius Malfoy, Draco's son.
Another common character could be Draco Malfoy. In some fanfics, Alya's relationship with Draco can be explored, whether it's a rivalry or an unexpected friendship. And of course, Dumbledore might also make an appearance to guide Alya on her journey within the wizarding world.