They could be forced into a situation where they have to rely on each other for survival. Like being trapped in a maze - like structure created by a powerful enemy. During their time together, they share stories about their pasts. Cyborg talks about his accident and how he became who he is, and Jinx might open up about her reasons for being a villain. This sharing can lead to a deeper connection.
Another way is through a common goal. Say there's a device that if misused could destroy the city, and both Cyborg and Jinx want to prevent that. As they work towards this goal, they start to respect each other's abilities. Cyborg respects Jinx's unpredictability as an asset in certain situations, and Jinx respects Cyborg's knowledge and power. This respect can then grow into a more complex relationship.
The relationship can start with mutual distrust. For example, they meet in a battle situation where they are on opposite sides. But then, as they encounter each other more often, they begin to notice small things about each other. Cyborg might notice Jinx's insecurities behind her chaotic facade, and Jinx might see Cyborg's struggle with his dual nature (human and machine).
Their relationship can be developed through shared adventures. For instance, when they go on a quest to find a lost relic. During this adventure, they rely on each other's skills, which builds trust.
It could start with a mutual respect for each other's abilities. Naruto might admire Tayuya's musical based attacks, and Tayuya could be intrigued by Naruto's never - give - up attitude.
By showing their shared history. Maybe start with a flashback of their childhood together, how they were friends or rivals from the start. This can set the foundation for their complex relationship in the present of the fanfic.
Another way is through a common enemy. Suppose a new dark force emerges that threatens both Tikal's spiritual realm and Chaos's domain. They are forced to put aside their initial differences and work together. During this process, they start to communicate more, share their feelings and fears. Tikal helps Chaos to control its power better, and Chaos gives Tikal the strength to face the new threat, thus strengthening their relationship.
In a fanfic, their relationship could develop through a series of magical duels. Each duel is not just about fighting but also about learning about each other. Harry might learn about Bellatrix's past that made her the way she is, and Bellatrix could be impressed by Harry's growth as a wizard. This understanding gained from the duels could lead to a more complex relationship between them.
Another way is through an accidental encounter that leads to a series of events. Let's say Darkrai accidentally enters Cressila's territory while fleeing from a group of hunters. Cressila is initially angry but realizes that Darkrai is in trouble. It decides to help Darkrai hide. During this time, they start to communicate. Darkrai is intrigued by Cressila's kindness, and Cressila sees that Darkrai is not as bad as it seems. From there, their relationship blossoms as they continue to interact and face new challenges side by side.
Their relationship could develop through shared experiences. For example, if they both get caught in a trap set by a third party, they have to rely on each other to escape. This would force them to communicate and start to understand each other.
By showing their shared history. Flashbacks to their early days together can add depth. For example, remember when they first met? That could be a great starting point to build on their relationship in the fanfic.
They could start by having simple conversations that go beyond their usual bickering. For example, sharing stories about their families or their dreams. This would break the ice and start to build a more positive connection.
Their relationship could be developed through shared interests. For example, both are interested in unique and delicious food. Bulma could cook special dishes for Beerus, which would gradually make Beerus see her as more than just an ordinary Earthling. He might start to respect and even protect her in return.