One possible theme is the fragility of sanity. When characters are in this adventure in madness, they often face situations that test how much they can hold on to their rational thinking. For example, they might see things that are not real or be in situations that defy logic.
Another theme could be self - discovery. Through the adventure in madness, characters may learn things about themselves that they never knew before. They might find hidden strengths or weaknesses as they struggle with the chaos around them. It's like a journey into the unknown parts of their own psyche.
One possible theme could be the consequences of impulsive actions. When a character has a moment of madness and acts without thinking, there are usually consequences that follow. Another theme might be self - control, as the moment of madness shows a lack of it. And perhaps the theme of redemption, if the character tries to make up for their moment of madness.
In an old, forgotten city, a group of adventurers embarked on an adventure in madness. They entered a strange building that was said to be cursed. Inside, they encountered illusions that made them question their own minds. One adventurer saw his worst fears come to life, another thought he was flying through space. But instead of running away, they decided to face this madness together. They held hands and pushed forward, hoping to find the source of this strange phenomenon and end it.
One possible theme could be the fragility of the human mind. Diane Borchardt might have faced some situation that pushed her mental state to the brink.
One possible theme could be self - discovery. If Gwen is in a new situation, like starting at a new school or in a new job, she has to figure out who she is and what she wants. Another theme might be love, for example, if Gwen falls in love with someone unexpected in the story. Friendship can also be a theme, say Gwen makes new friends who help her through a difficult time.
Unity is also a likely theme. 400 boys can achieve great things when they work together. They might come together to fight against an injustice in their town or to save a local landmark from being destroyed. Their combined efforts can show the power of unity and how a large group can make a difference.
One possible theme could be transformation. If 'TG' implies some kind of change, the characters in Adventure Time are no strangers to that. Finn grows throughout the series, and a TG - related story could focus on his further transformation, perhaps in his understanding of the world around him.
Another theme could be self - discovery. During the adventure, each friend might learn something new about themselves, like their hidden strengths or weaknesses.
They could go exploring an old abandoned house. One of the friends might be a bit scared at first, but the other two encourage him. Inside the house, they discover a hidden room with old treasures or a diary that reveals a long - forgotten story.
Another theme might be self - discovery through love. The characters' love could be so intense that it forces them to face parts of themselves they didn't know. For instance, a character who was always shy and reserved might discover a bold side of themselves because of this 'mad' love in the fanfiction. This could be related to the challenges and growth that often occur in 'Stranger Things' as the characters face the unknown.
Isolation and connection. The quiet boy may initially seem isolated, but through the story, he could form deep and meaningful connections with either other characters or nature. For example, he might find a kindred spirit in an unlikely place or person. In some stories, the quiet boy may be an outcast in his community at first, but then he discovers a group that values his quiet nature, like a group of artists or thinkers who are also introverted.