The setting can play a role too. Imagine Finn is in the middle of a grand ball in the Ice Kingdom and he accidentally spills a drink all over himself. The contrast between the formal setting and his clumsy accident makes his embarrassment more palpable. Also, internal thoughts can be used. The author can write about Finn's thoughts racing and him scolding himself internally for being so stupid, which is a very effective way to show his embarrassment.
By using body language descriptions. For example, the author can write about Finn blushing furiously, looking down at his feet, and fidgeting with his hands. This shows his unease and embarrassment clearly.
Dialogue can also be a great tool. If Finn stutters or says something really awkward when he's embarrassed, it makes it more believable. For instance, if he's caught off - guard by a compliment and he just mumbles some incoherent response. And the reactions of other characters around him can enhance this. If Jake gives him a knowing look or Princess Bubblegum raises an eyebrow in amusement, it adds to the portrayal of Finn's embarrassment.
A writer can describe Finn's physical reactions. For example, they can write about his eyes welling up with tears that start to roll down his cheeks. Mentioning how his voice might crack when he tries to speak can also be effective. Another way is to show his body language, like his shoulders slumping as he cries.
One common theme could be Finn getting embarrassed in front of his friends. For example, he might trip and fall while trying to show off a new skill. Another theme could be his romantic embarrassments, like when he tries to ask a girl out and stumbles over his words.
Well, in fanfics regarding Finn's arm in Adventure Time, some might focus on a magical or mythical origin for his arm. For example, it could be revealed that his arm has a connection to some ancient power or being from the Land of Ooo. It could also be used as a plot device to show Finn's growth. If his arm is injured, he might have to learn to adapt and become stronger in other ways, which would be an interesting character development arc in the fanfic.
One idea for an Adventure Time Finn arm fanfic could be that Finn discovers his arm has the ability to phase through solid objects. This new power could lead him on a quest to find out where it came from and how to control it. He might have to visit some of the more mysterious places in Ooo, like the Crystal Dimension, to get answers.
Princess Bubblegum could be one. She's smart, powerful, and has a long - standing relationship with Finn. Another could be Flame Princess. Their relationship has always been complex and full of chemistry. And maybe Marceline could also be part of it. She and Finn have a great friendship that could potentially develop into more in the context of a harem fanfic.
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.
One common theme is friendship. Finn is all about his friends in the show, and in fanfics, his relationships with Jake, Princess Bubblegum, and others are often explored further. Another theme is self - discovery. Finn is constantly growing and learning about himself, and fanfics often take this aspect and expand on it. For example, in some fanfics, he discovers new powers or abilities that make him question who he really is.
He could cry due to unrequited love. Finn has had his fair share of romantic interests in the show. In a fanfic, if the girl he loves doesn't return his feelings, it would be a heart - breaking situation for him. Also, in some fanfics, Finn might be confronted with the harsh reality of the world he lives in. Maybe he discovers something truly dark about the Land of Ooo that shatters his innocent view of it, causing him to break down in tears.
The Fire Kingdom's Flame Princess could be an ally too. Her mastery over fire could complement Finn's powers in combat situations. Also, the various magical creatures in Ooo, like the gnomes or the fairies, could band together and support Finn. They might have their own ancient knowledge or magic that could be useful to Finn in his adventures with his godlike powers. Finn's kindness towards them in the past might make them more inclined to help him out.
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.