Obviously, Albus would be one of the main characters as the title implies he is the one who 'becomes' like Harry. And Harry himself would also be a central figure, either as a sort of inspiration or even in flashbacks.
There could be new characters introduced, like old family retainers of the noble family Harry is now part of. Maybe an old wizard who serves as an advisor to Harry on matters of the lordship. And of course, some antagonists such as rival lords or wizards who don't want Harry to gain too much power.
Obviously, Albus Potter and the Marauders - James Potter, Sirius Black, Remus Lupin and Peter Pettigrew. There might also be some other characters like Albus's friends or professors who could be involved in the story.
Obviously, Nightwing himself would be the main character as he's the one taking on the Batman role. Robin, if there's a younger Robin at the time in the fanfiction, would also be a key character. He might look up to Nightwing in his new role or have some doubts about him filling Batman's shoes.
In most 'Harry Albus fanfic', the main characters are Harry and Albus. Harry, with his well - known past of fighting Voldemort and his experiences at Hogwarts. Albus, on the other hand, might be shown as a young wizard learning from Harry, or they could be on an equal footing in some adventures. Sometimes, other characters from the Harry Potter world like Hermione or Ron might also make appearances to support or interact with Harry and Albus.
Hinata would be an important character as Naruto's wife. She could support Naruto in his Hokage duties and also play a role in the social aspects of the village. Their children might also be part of the story, representing the new generation.
Obviously, Harry would be the main character. Since it's about him being a Saiyan. And I think some of his friends from the Harry Potter series might also be important characters, like Hermione and Ron. They could react to Harry's new Saiyan identity in different ways.
Obviously, Harry would be the main character as the title implies. But other characters like Hermione and Ron would also be important. They could either be part of Harry's regime, reluctantly or wholeheartedly, or they could be part of the resistance against his dictatorship.
Obviously, Harry would be the main character. Since it's about him being a playboy, he would be at the center of the story. There might also be his friends like Ron and Hermione. They could play important roles in either supporting or trying to change Harry's playboy ways.
Harry for sure. Then there could be his samurai mentors. Maybe there would also be some characters from the original Harry Potter world who interact with him in this new samurai - influenced life. For example, Hermione might visit him in the samurai village and be amazed at the new skills he has learned.
Harry is the central character for sure. Alongside him, there might be some Kaminoan scientists or military leaders. For example, a Kaminoan scientist who is intrigued by Harry's magic and wants to study it. Or a military leader who sees Harry as a potential asset in their defense against some new threat.