Putting them in difficult situations where they have to rely on each other is another way. Like if they are trapped in a maze and each character has a unique skill that is needed to find the exit. By working together, their relationships will grow. For instance, Vanilla might use her motherly instincts to keep everyone calm, while Sonic uses his speed to scout ahead and Cream and Lemon help with problem - solving.
Another idea is a story where Cream discovers a new power within herself while on an adventure with Sonic, Vanilla, and Lemon. This new power could be related to some ancient energy source in their world. And the story could revolve around her learning to control it with the help of her friends and how it changes their dynamic.
For Knuckles, you could explore his relationship with his tribe more deeply. Maybe in the fanfiction, he discovers some ancient scrolls left by his ancestors that give him new powers or knowledge. This could change his interactions with Rouge and Sonic. As for Rouge, you could develop her character by showing more of her backstory, like how she became interested in jewels and espionage in the first place.
Obviously, Cream and Vanilla Lemon are the main characters. Cream is often depicted as a cute and innocent character, while Vanilla Lemon might be something unique, perhaps a magical being or a character with special powers related to vanilla and lemon elements.
Have them face a difficult decision together that affects the whole family. Their different viewpoints could lead to some arguments at first, but through communication and understanding, their relationship would grow stronger. For instance, if they had to decide whether to send a family member away for training or keep them at home for safety.
Let Silver face moral dilemmas in the Sonic X fanfiction. Maybe he has to choose between saving a large group of people in the present or preventing a greater disaster in the future. This would show his growth as a character and how he weighs different values.
You could also develop his character by showing his vulnerability. Maybe there's a situation where his dark powers are not enough, and he has to face his weaknesses. This can make him more relatable and complex.
Friendship is a very common theme. Writers often explore how Cream and Vanilla become friends and how their friendship grows over time.
For Max and Ginny, they could bond over a shared love of books. They start a book club together and through discussing different novels, they understand each other better. Their friendship then influences how they interact with others in the group.
For Gray and Juvia's relationship, they could have more heart - to - heart conversations. Maybe they share their fears about the future and how to raise their family. As for their relationship with their children, they can have family outings where they teach important values like loyalty and courage, which are big in the Fairy Tail world.
For Raku, he could be developed further by exploring his insecurities more deeply. In the original story, he's often caught up in the love polygon, but we could see him face his own self - doubt about whether he's worthy of Chitoge's love. This could make his character more relatable.