Princess Bubblegum can also be a central character. Given her scientific nature, a fanfiction could involve her creating something that causes weight gain, either for herself or others, and then having to deal with the consequences in a way that's in - character for her.
Finn is often a main character in such fanfictions. Since he is the protagonist in the original 'Adventure Time', it's natural for writers to explore different scenarios involving him, like unexpected weight gain and how he copes with it.
Jake is another popular character. His shape - shifting abilities could be interestingly intertwined with a weight gain plot. For example, if he gains weight, how does it affect his ability to transform into different shapes? Writers can have a lot of fun exploring this.
Finn is definitely one of the main characters. In Farmworld, he has a different life compared to the regular Adventure Time universe, and fanfictions often explore his new experiences, like being a farmer and a father.
Finn and Jake are often the main characters in Adventure Time Canyon fanfiction. They are the protagonists of the original show and their adventures are always exciting to write about in the context of the canyon.
Finn and Jake are often in these fanfictions. They are the main protagonists in Adventure Time, so it makes sense that they'd be involved when it comes to Golb. They're always up for an adventure and facing a big threat like Golb is right up their alley.
Princess Bubblegum also frequently appears. Her scientific knowledge and leadership in the Candy Kingdom can be useful in dealing with the mysteries that knots might bring. For example, if a knot is causing some sort of chaos in the kingdom, she would be there to analyze and try to solve it.
Finn and Jake are often the main characters in 'Adventure Time Family Fanfic'. They are the core of their little family unit in the show, so it makes sense for them to be central in fanfics too. Their friendship and brother - like bond is a great foundation for family - centered stories.
Princess Bubblegum can also be a main character. Given her scientific mind, she could be researching something in the canyon, like unique plant life or strange geological formations. So, in many fanfics, she plays an important role in the canyon - related adventures.
Quinn Fabray could be involved too. Given her history of being concerned about her looks and status, a weight gain story for her could be about her learning to love herself regardless of the number on the scale. It could also involve her relationship with the other Glee club members as they support her through the process.
Well, obviously Tails is the main character as it's about his weight gain. But Sonic often shows up in these fanfictions too. Sonic might be there to support Tails, or he could be initially confused about what's happening to his friend. Another character could be Dr. Eggman. He might be the cause of Tails' weight gain, either intentionally through some evil plan or accidentally because one of his inventions backfires.
Twilight Sparkle is often involved. As a central character in the My Little Pony universe, her studious and sometimes self - conscious nature can be interesting to explore in the context of weight gain. Pinkie Pie could also be a main character as her love for parties and food might lead to some scenarios of weight gain. And Rainbow Dash, with her athletic build, could have an interesting character arc if she were to experience weight gain, perhaps struggling with her identity as an athlete.
It depends on the specific fanfiction, but often the main characters from the original work that inspired it would be prominent. They might be the ones whose stories are being further explored or whose relationships are being developed in new ways.