Well, Bowser is a must - have main character. Then, perhaps a new, original character could be created specifically for this fanfiction. This character could be a tiny, intelligent being that has always lived inside Bowser and knows all the secrets of his internal world. Princess Peach could also be a main character if she is kidnapped and ends up inside Bowser in a different way than usual. She could bring a different perspective to the inside world of Bowser and interact with the other characters in a unique way.
Obviously, Bowser himself would be a main character. He is the one whose inside story we are exploring. Luigi could also be a main character if he somehow gets trapped inside Bowser. And some of Bowser's minions like Goomba or Koopa could be main characters as well, as they live inside Bowser's kingdom and might play important roles in the events happening inside Bowser.
For a 'bowser's inside story fanfiction', Bowser is the central figure, of course. But Mario could be a main character too. Imagine Mario gets shrunk down and has to journey through Bowser's insides to find a way to defeat him from within. Another possible main character could be a healer or a wizard - type character who enters Bowser's body to cure him of a strange ailment. And the little critters that are native to Bowser's insides, like the bacteria - like creatures that keep his body functioning in a strange way, could also be main characters. They could have their own personalities and motives, and their actions could greatly affect the overall story.
Bowser is one of the main characters for sure.
In'mario bowser inside story', the two main characters are Mario and Bowser. Mario is known for his heroic deeds in the Mushroom Kingdom, always ready to save the day. Bowser, on the other hand, is usually the antagonist. But in this story, their relationship is more complex. With Mario inside Bowser, they both have to work together in some ways to face the challenges that come their way. Their interactions and the contrast between their abilities and personalities make them the main focus of the game.
Obviously, Dark Bowser would be a main character. There might be some side characters like his minions who play a role in his plans. And perhaps there are heroes or other antagonists who cross paths with Dark Bowser in the story. Maybe there are some unique characters created specifically for this 'dark bowser inside story' that we don't know about yet.
Well, Bowser is the central character in 'Dark Star Bowser's Inside Story'. Since it's about his inside story, he takes the spotlight. But it's possible that other characters from the Mario universe are also part of the game. Maybe there are Toads who play a role, like providing help or information. And it wouldn't be surprising if there were some new characters created specifically for this story, characters that are related to the dark star in some way, either as its minions or as characters trying to stop its evil influence.
Bowser and the star sprites are the main characters.
The main characters are Mario, Luigi, and Bowser.
Well, Bowser is surely a main character as it's his inside story. There may be a protagonist, perhaps a small character with special abilities that can navigate through Bowser's insides. It could also be that some of Bowser's minions play important roles. They might be either helping or hindering the progress of the main character inside Bowser. Additionally, there could be some kind of guide character, like an old wise creature that has lived inside Bowser for a long time and gives hints to the main character.
Obviously, Bowser is a key character in 'the dark star bowser's inside story'. His actions and what happens inside him due to the Dark Star are central. Additionally, there could be other important characters such as Luigi or Mario if they are involved in the events related to Bowser and the Dark Star. His minions, who are always by his side, also play important roles as they might be affected by the changes in Bowser and the presence of the Dark Star.
Definitely Twilight Sparkle. She's always the one leading the way in most of the pony adventures, so she would be a key character in this version too.
In 'Mario and Luigi Inside Bowser Story', the main characters are Mario and Luigi. These two plumbers are always on adventures. Here, they find themselves in the rather unusual situation of being inside Bowser. Bowser is also an important character. He is the big bad guy, and his body becomes the setting for this part of their adventure. There might also be other characters like Bowser's minions that play a role in the story.