One way could be through a magical transformation plot. For example, Marco might find a mysterious spell or artifact that starts the process of changing his gender. This could lead to a series of comical and also self - discovery moments as he adjusts to his new body and the different social expectations that come with being female.
It could also be a more psychological exploration. Marco might have always felt that he had a female side to his personality. Through his journey in the fanfiction, he could gradually embrace this side more fully, perhaps by changing his appearance and mannerisms to be more feminine, and in the process, find acceptance among his friends and in the fictional society.
Another approach could be a body - swap type of scenario. Maybe Marco accidentally switches bodies with a female character. In this situation, he has to navigate her life while also dealing with his own feelings about being in a female form. He could learn about the challenges and joys that females experience in that fictional world, which could change his perspective on gender.
Rosie might have a complex personality in the fanfiction. She could be initially scared of the pregnancy but then gradually embrace it. You can show this through her conversations with friends and family. Marco, on the other hand, could be shown as having his own insecurities. Maybe he's worried he won't be a good father because of his own father's absence in his life. As the story progresses, he overcomes these insecurities.
The 'fish - out - of - water' trope is common. Since Marco is male and wants to be female, he'll likely face situations where he's unfamiliar with female - specific things like certain types of clothing, social etiquettes among women, etc. For example, he might struggle with wearing a dress for the first time or understanding the subtleties of female - only conversations.
Marco could be developed by exploring his internal conflict. As a demon, he might have new instincts that go against his human values. For example, he may struggle with the urge to be more aggressive or use dark magic when he used to rely on his wits and martial arts skills.
If 'Marco Sees Stars' is in a fanfiction, it can be positive in terms of character growth. The act of seeing the stars could be a catalyst for Marco's personal development. It might make him more introspective, leading to positive changes in his attitude, values, and relationships with others.
One way to develop the theme is by exploring the family reactions. The families of the characters might have different expectations and reactions to this 'Marriage in the Dark'. Some might be supportive, while others might try to interfere. This can create external pressure on the relationship. Additionally, you can play with the idea of love evolving in this unique situation. Does it start as a reluctant acceptance and then grow into true love? Or does it remain a struggle throughout the fanfiction? These are all ways to develop the 'Marriage in the Dark' theme.
One way is through shared secrets. For example, Ace could tell Marco a secret he's been holding about his past that he hasn't told anyone else. This would deepen their connection during their cuddle time as it shows a new level of trust.
The theme of mind control can be developed by showing the different ways it can be used. It could be a weapon in a battle, like one side using it to make the other side's soldiers turn against them. Or it could be used secretly to manipulate political decisions in Camelot.
To develop it as a theme, the 'pearl in the rocks' could be about finding beauty or value in the unexpected. In Loki fanfiction, this could mean that Loki discovers things or characters that are like 'pearls' in the most unassuming places. For instance, he might find a small, unassuming village that has a hidden power or a person who seems ordinary but has a great secret or ability. This theme could also be about Loki's own self - discovery, realizing that he has qualities within himself that are like a 'pearl' even if he has been made to feel like a 'rock' by others in his past.
To develop this theme, the writer could also focus on Kakashi's relationships. His guilt might cause him to distance himself from others, like his students. A good fanfiction would show how Naruto tries to break through that wall of guilt and help Kakashi move forward. This can add a lot of emotional depth to the story.
One way is to have a character embody the starlight. This character can bring hope to others in a dark world. For instance, a young wizard in a world full of dark magic could be the starlight, using his powers for good.