In the fanfiction, their relationship might develop through shared experiences. Since Shadow is depressed, Rouge could take him to new places or introduce him to new things. As they do these things together, they get to know each other better. Shadow might start to appreciate Rouge's company more and more, and this could lead to a romantic relationship developing between them. For example, they could go on a night flight together, and during that time, they have a deep conversation that brings them closer.
Their relationship can develop as Rouge shows empathy towards Shadow's depression. She might start by just being a listening ear. As time passes, Shadow begins to trust her more and opens up. This trust can then turn into a deeper connection, and they may start to rely on each other more.
Their relationship in a married fanfiction would develop gradually. At first, there would be some awkwardness as they adjust to living together. But over time, they would start to understand each other better.
One possible plotline could be that Rouge discovers Shadow in a state of deep depression. She tries to cheer him up by taking him on adventures, showing him the beauty in the world that he's been missing. Another could be that Shadow's depression is a result of his past traumas, and Rouge, with her understanding nature, helps him face those demons. Maybe they start off as just friends, but as Rouge continues to be there for Shadow, their relationship deepens into something more romantic.
Highlight their differences at first. Shadow is more brooding and serious, while Rouge is flirty and sly. But as the story progresses, they start to see the good in each other's qualities. A situation where Rouge gets injured and Shadow takes care of her can be a turning point. His gentle side emerges, and Rouge realizes she has stronger feelings for him. This can lead to a passionate kiss.
At first, their relationship might be rocky. Saitama, being depressed, might not be very receptive to Tornado's brash personality. But as time passes, Tornado could start to show a more caring side. She might use her powers to create small, positive things for Saitama, like a beautiful garden in the middle of the city just for him to relax in. This could start to break down Saitama's walls, and they could gradually become friends.
Well, other characters could start to notice his change in behavior. For instance, Arthur might notice that Merlin is less talkative and more withdrawn. This could lead to Arthur trying to cheer him up or figure out what's wrong, which could then drive the plot forward as they bond over this new situation.
For Rouge, emphasize her cunning nature. In a Halloween setting, she could be using her skills to find hidden treasures or secrets. Describe her sly smiles and quick thinking. For Shadow, show his brooding side but also his loyalty. Maybe he's reluctant to get involved in Halloween hijinks at first but does it for his friends. For Knuckles, play up his strength and protectiveness. He might be on high alert during Halloween, thinking there are threats to his island.
You can develop their relationship through shared challenges. For example, if they face a common enemy or a difficult task like decrypting a dangerous code together. This forces them to rely on each other and builds trust.
Their relationship can develop through mutual respect. Gohan respects Android 21's strength and intelligence, while Android 21 respects Gohan's kind heart. This respect can turn into friendship first. For example, they train together, learning from each other's fighting styles. Then, as they spend more time together, they start to notice little things about each other that they like, which gradually leads to a romantic relationship.
Shadow would likely become more protective. He's usually a solitary and tough character, but with a baby on the way, he'd soften up. Rouge, on the other hand, might become more nurturing. Her sly and flirtatious side could be toned down as she focuses on motherhood.
To develop their relationship, you can create situations that force them to rely on each other. Say there's a magical storm that endangers Brulee's home. The OC steps in to help her protect it. This creates a sense of indebtedness and closeness. Also, include some tender moments, like the OC bringing Brulee a special treat from their travels. These little things add depth to their relationship.