Boruto, Naruto's son, is an obvious choice. He already has his own story in the Boruto series, but in a fanfic, you can take his character in new directions. Himawari, Boruto's sister, could also be a main character. She has the potential for great power and a unique personality.
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.
Boruto Uzumaki is very popular. He is Naruto's son and has his own unique set of skills and challenges. His relationship with his father and his journey to become a great ninja are often explored in fanfiction.
There could be new rival characters in 'pokemon next gen fanfic' that are really popular. They might be more complex than the traditional rivals, having their own backstories and reasons for competing. And sometimes, the descendants of well - known characters from the original Pokemon series can be popular. They carry on the legacy but also add their own twists. Another type of popular character could be a Pokemon researcher who discovers new things about Pokemon in the fanfic.
Albus Severus Potter is quite popular. He's the son of Harry Potter and has his own set of insecurities and challenges to overcome. Scorpius Malfoy is also a favorite. His friendship with Albus is often explored in fanfics, showing a different side to the Malfoy family legacy. Then there's Rose Granger - Weasley, who is smart and strong - willed, just like her mother Hermione.
In a naruto next gen fanfic, you might consider having the new generation face a threat that is completely different from what the previous generation dealt with. It could be a new type of enemy that uses a form of jutsu that no one has ever seen before. This would force the young ninjas to think outside the box and develop new strategies. You could also explore their personal growth, like how a character who was initially shy and insecure becomes a strong and confident ninja through their experiences.
One potential main character could be a young Iburi Clan member who is just starting to come into their powers. They would be full of enthusiasm and curiosity about their clan's abilities. Another could be an older, more experienced Iburi Clan ninja who has seen a lot and is now a mentor figure. And then there could be a half - Iburi Clan character, who struggles with fitting in both the Iburi Clan world and the world of their other heritage.
The children of Nagisa and Kayano could be main characters. They might inherit some of their parents' skills and quirks. For example, Nagisa's son could have his father's stealthy nature.
Naruto himself could also be a main character. He could visit the Hidden Star Village and interact with the Hoshikage, getting involved in the village's affairs and helping them solve their problems. This would be an interesting way to incorporate the Naruto we all know into the fanfic.
A likely main character could be a young ninja who discovers he has the 'One for All' power. He would be on a journey to understand and control it, while also dealing with the normal challenges of being a ninja in the Naruto world, like training and making friends.
I don't know for sure as I haven't read it. But usually, in such light novels, there could be a young and curious protagonist who is eager to explore the full - dive world.