In fanfiction, Gumbald's character could be developed by delving into his past. His relationship with Finn could be used as a tool for this. For example, if it's revealed that Gumbald had a similar start to life as Finn, but took a different path. Finn could then try to understand Gumbald better and in the process, Gumbald might start to re - evaluate his own actions. Finn's character could grow by learning from Gumbald's mistakes and becoming more cautious in his adventures.
In fanfiction, Gumbald and Finn could be rivals. Gumbald, being a devious character, might see Finn as an obstacle to his plans in the Land of Ooo. Finn, on the other hand, would stand up against Gumbald's evil schemes, leading to an intense rivalry filled with battles and strategic mind - games.
In fanfiction, their relationship could be developed by having them teach each other things. Finn could teach Marceline about his simple but effective survival skills, like building shelters or finding fresh water. Marceline, on the other hand, could teach Finn more about the complex magic that exists in the Land of Ooo. This exchange of knowledge would not only bring them closer but also make them respect each other more. Also, they could get into some light - hearted arguments about different ways of doing things, which would then lead to a better understanding of each other's personalities.
One way to develop their relationship is by having them face a conflict that tests their friendship. Maybe there's a misunderstanding where Finn is accused of stealing a powerful spell from Huntress Wizard. As they work through this issue, they'll understand each other better. Also, they could have quieter moments together, like when they sit by a magical stream and Huntress Wizard tells Finn stories about the ancient magic of Ooo. This kind of interaction can deepen their connection. Additionally, if they have to protect each other from a common enemy, it will show how much they care for one another.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of Adventure Time fanfictions, and you can specifically search for ones related to Gumbald. Another option is FanFiction.net. There are many talented writers on these platforms who might have created some great Gumbald - centered stories.
Jake would be devastated. He and Finn are best friends. Jake might become withdrawn and less likely to go on adventures. He could also become overprotective of Finn's memory. Princess Bubblegum would likely be deeply affected too. She might feel guilty if she couldn't use her scientific knowledge to save Finn. She could also be motivated to find a way to bring him back. Marceline would probably be very sad and angry. Her relationship with Finn was special, and his death could make her more cynical about the world.
Writers can create unique characters by making Finn's hair a sort of magical conduit. There could be a character who is a hair - stylist in the Land of Ooo, but with a magical touch. They can transform Finn's hair into different forms, each form having a different power or effect. This character could also have a backstory related to how they discovered their unique ability with Finn's hair. Another idea is to create a character who is envious of Finn's hair and tries to steal its powers, leading to all sorts of conflicts and adventures in the story.
In some Adventure Time fanfictions, Finn might be betrayed by a character he trusted deeply, like Jake. For example, Jake could make a deal that goes against Finn's values in order to protect the Candy Kingdom, leaving Finn feeling betrayed as he sees it as a moral compromise. Another instance could be a new character in the fanfiction who befriends Finn only to steal his magic sword for their own gain.
A good way to develop their relationship is by introducing a conflict that they have to resolve together. Maybe there is a misunderstanding between them that leads to a rift. But as they work through it, they realize how much they value each other. They could also have moments of vulnerability, like Finn sharing his fears about not being good enough, and Huntress Wizard sharing her insecurities about her magic abilities. This would make their bond stronger.
Well, obviously Finn's sister herself is a popular character in these fanfictions. Also, Jake the dog might be involved as he is Finn's best friend. Princess Bubblegum could also be popular as she is an important figure in the Adventure Time world. She might interact with Finn's sister in various ways, like teaching her some science or asking for her help in a kingdom - related matter.
In the fanfic, their relationship could be developed by putting them in situations where they have to make sacrifices for each other. Maybe Finn has to give up a chance at a great treasure to save Huntress Wizard, or Huntress Wizard risks her magic to protect Finn. These selfless acts can make them realize how much they mean to each other. Also, they could have simple, everyday interactions like cooking together or sharing stories around a campfire that slowly build a bond between them.