Obviously, Naruto and Inoichi are the main characters. Naruto is the one being adopted, and Inoichi is the one doing the adopting.
In the 'inoichi adopts naruto fanfic', the main characters are Naruto and Inoichi for sure. However, other characters from the Naruto series could also play important roles. For example, Shikamaru and Choji, as they are friends with Ino and could be part of Naruto's new social circle. Also, characters like Tsunade might be involved as she is the Hokage and would need to oversee such an adoption. And of course, the rest of the Yamanaka clan could be part of Naruto's new family life, each having their own influence on Naruto's growth and development.
Well, perhaps it could be about Inoichi seeing Naruto's loneliness and taking him in. He might teach Naruto some mind - related jutsu since he's an expert in that area. Naruto could also bond with Inoichi's family, like Ino, and they could all become a sort of surrogate family for Naruto.
Kakashi could also play a role. He has been Naruto's mentor for a long time. So, he might have some mixed feelings about Itachi adopting Naruto. He could be suspicious of Itachi's motives at first but then gradually come to understand Itachi's positive influence on Naruto. Their interactions could be really fun to read about, especially when Kakashi tries to give Itachi some advice on how to handle Naruto's wild nature.
Obviously, Haku and Naruto are the main characters. Haku, with his ice - based jutsu and complex backstory, and Naruto, the aspiring Hokage with his Nine - Tailed Fox power. They are the central focus as the story revolves around Haku adopting Naruto.
Obviously, Mikoto and Naruto are the main characters. Mikoto is the one doing the adopting, and Naruto is the one being adopted.
Well, obviously Naruto himself would be the main character. There could also be his friends like Sasuke and Sakura, who might be involved in the interactions between the two Narutos. Maybe they are confused at first by seeing two Narutos, but then they help them figure out what's going on.
It could still be Naruto himself. Since he's the central character in the original series, many fanfics would likely continue to build on his story.
The main characters would be Carlisle and Harry. Carlisle is the adoptive father, so he'll be responsible for Harry's well - being in this new family. Harry, of course, is the central figure as the adoptee. However, we can't forget about the rest of the Cullen clan. Alice, for example, might use her power to foresee any potential dangers that could come to Harry. Jasper could help Harry with self - control, as he has his own struggles with it. So, all these characters would be integral parts of the fanfiction.
Obviously, Naruto would be one of the main characters as the story is about him being the son of Whitebeard. Whitebeard himself would also be a major character, even if he might not be around for the whole story. And then there would be the other members of the Whitebeard pirates, like Marco. They would play important roles in Naruto's life in the pirate world, either as mentors or comrades.
Obviously, Naruto and Jiraiya are the main characters. They are the focus of the 'naruto meets jiraiya' concept. Naruto, the energetic and determined ninja, and Jiraiya, the wise and powerful mentor.
Naruto is surely going to be one of the main characters. After all, it's a Naruto fanfic. Sasuke is also very likely to be there as his rival and friend. Sakura might also play an important role.