Obviously, Tsuna is the main character. But often, his friends like Gokudera and Yamamoto are also involved. Since Tsuna's anger usually has something to do with his relationships with them, they play important roles in the fanfic. For example, they might be the ones who trigger his anger or the ones who have to deal with the consequences of his anger.
Tsuna's mother is another character that can be involved in 'angry tsuna fanfic'. If Tsuna is angry about something related to his family or his normal life outside of the mafia world, his mother could be part of the story. Maybe Tsuna is angry because he feels his mother is being put in danger due to his mafia - related activities, and this anger drives him to take certain actions to protect her.
In 'naruto angry fanfiction', characters like Hinata can also be involved. If she is in danger or if Naruto feels that he couldn't protect her well enough, it can stir his anger. And villains like Orochimaru or Madara can be present as they are often the source of problems that make Naruto angry, whether it's through attacking the village or harming his friends.
The Cullens are often involved too. Edward, for example, as Alice is part of the Cullen family. Their interactions can be explored in different ways in fanfic, perhaps showing a different side of their family dynamic.
Naruto is almost always the main character in 'Naruto Foodgasm Fanfic'. His love for food is well - known in the original series, so it makes sense. Sometimes his friends like Choji, who also loves food, are involved too.
In addition to the main Naruto crew, characters like Jiraiya can be important in 'prodigious naruto fanfic'. He was Naruto's mentor, so in fanfics that explore Naruto's growth further, Jiraiya is likely to be there. Also, villains like Orochimaru or Pain can be central in some fanfics, especially those that deal with Naruto facing greater threats or trying to redeem the villains.
Another character that can be involved is Kakashi. He might be the one who discovers Naruto has been hypnotized and uses his wisdom and skills to try and reverse it. Also, characters like Sakura could play a role. She may be worried about Naruto and try to help in any way she can, like researching about the hypnosis or providing medical support if needed.
Obviously, Tenten is the central character as she is the one who is pregnant. In many fanfics, Rock Lee might be involved. Since they are comrades and friends from the same village, he could be there to offer his support or protection. Maybe he helps her with daily tasks when she starts to find it difficult due to her pregnancy.
Princess Peach could also be a main character. In some fanfics, she could be the catalyst for Bowser's death. Maybe her capture by Bowser sets off a chain of events that ultimately leads to his end, or she could be the one who finally defeats him in a twist of the story.
Obviously, the Yellow Flash himself is a main character. But often, other characters from the Naruto series also show up. Naruto might be involved as he's the main protagonist of the original series. Minato, as the Yellow Flash, could have interactions with Kakashi, his former student. Also, characters like Jiraiya, who was Minato's teacher, could be part of the story, as their relationships can be further explored in fanfics.
Well, of course, Harry Potter himself is often the central figure. His friends Ron Weasley and Hermione Granger usually tag along. Neville Longbottom might also be there, as he becomes more and more part of their group as the series progresses. Sometimes Luna Lovegood joins in with her unique and dreamy perspective on magic, which can add a lot of fun and quirkiness to the vacation adventures.
Obviously, Ruby herself is the central character. But often, her team members like Weiss, Blake, and Yang are also involved. They play important roles in either causing the situation where Ruby snaps or in helping her get through it.