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 mind and leadership in the Land of Ooo make her a key character. She might try to analyze Golb or come up with a plan to protect her kingdom from Golb's potential destruction. Marceline is another one. Given her connection to the dark and mysterious side of the Adventure Time world, her past encounters with Golb can be explored further in fanfiction.
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 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.
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.
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.
Coco herself is, of course, a main character in most coco fanfiction. She is the center of the story, whether it's about her music career or her family relationships.
Willy Wonka is of course a main character. He is often depicted as an eccentric and brilliant chocolatier with many secrets. The Oompa - Loompas also feature prominently as his helpers in the factory, with their unique songs and personalities.
Obviously, the Wonderbird itself is a main character. Often, there might be a young wizard or witch who befriends the Wonderbird.