They could start off as acquaintances with mutual respect. Bulma respects Android 18's power, and Android 18 respects Bulma's intelligence. As they interact more, they find common interests. For example, they both have a connection to the world of technology in different ways. This could lead to a deeper friendship where they rely on each other for support.
Another way their relationship could develop is through a shared goal. Let's say there's a new enemy in the Dragon Ball Z universe that is targeting both Bulma's technology and Android 18's power source. They would have to work together to defeat this enemy. Along the way, they would learn about each other's strengths and weaknesses, and their relationship would transform from a simple alliance to a true friendship full of trust and loyalty.
It could also be a fanfic centered around their friendship. Android 18 might initially be cold towards Bulma, but as time goes on, they start to bond. Bulma could introduce Android 18 to the joys of normal life, like shopping or going to the beach. And Android 18 could protect Bulma from threats that her scientific work sometimes attracts. In the end, they become inseparable friends, changing the way the other characters view Android 18.
It could start as a mutual respect for each other's power. Goku would admire Android 21's combat abilities, and Android 21 would be intrigued by Goku's Saiyan strength.
In the fanfiction, their relationship might start off as a bit of a shock to both of them. But gradually, they begin to respect each other more. Goku starts to see Bulma's intelligence and how it can benefit their family and the world. Bulma, on the other hand, comes to admire Goku's unwavering sense of justice and his strength. They communicate more often, sharing their thoughts and dreams. For example, Goku might tell Bulma about his Saiyan heritage in more detail, and Bulma might share her latest scientific ideas with Goku. This sharing helps them grow closer together.
Well, in many Dragon Ball Z fanfics about Vegeta and Bulma, their relationship is a key aspect. Vegeta starts off as this aloof and somewhat arrogant Saiyan. Bulma, on the other hand, is used to getting her way. But as they spend more time together, they start to understand each other better. Vegeta begins to care for Bulma and their family, which is a huge change from his initial self - centered attitude. And Bulma supports Vegeta in his battles, not just as a spectator but as an important part of his life.
Fanfic writers often develop their relationship through domestic scenes. For example, showing Vegeta helping Bulma in the kitchen, which is completely out of his comfort zone as a Saiyan warrior. This shows his willingness to adapt for her. They also might develop it through arguments that lead to a better understanding. Like when Bulma gets mad at Vegeta for over - training and neglecting his family, and through their argument, they both realize what's important to each other. Writers also use their shared love for Trunks to strengthen their bond. They both want the best for their son, and this common goal unites them in different ways in fanfictions.
The development of their relationship was a long process. Vegeta, being a Saiyan, was not used to the concept of love or family in the way humans do. Bulma, being an Earthling, had her own ideas about relationships. Initially, Vegeta might not have even realized his feelings for Bulma. But as he stayed on Earth longer, he saw her intelligence, her tenacity, and her beauty. Bulma, in turn, saw the change in Vegeta from a cold - hearted warrior to someone with more depth. Their relationship really started to take off when they became parents, as it made Vegeta more committed to his new family on Earth.
At first, they were just partners in the search for Dragon Balls. Bulma was attracted to Goku's unique naivete and strength in a way.
Perhaps the fanfic could be a time - travel story. Android 21 accidentally sends Goku back in time to a point where she was first created. Goku then tries to prevent her from becoming the villain she was meant to be. This would involve Goku having to deal with the scientists who created her and convincing them to take a different path in their research, all while trying to find his way back to his own time.
Well, one possible fanfic could be about Android 18 and Raditz teaming up against a common enemy. Maybe they initially start off as reluctant allies, but as they fight side by side, they begin to respect each other's strength.
They could team up to invent something amazing. Bulma has the brains and Gohan has the power and knowledge of the Saiyan abilities. Maybe they create a new type of energy shield that can protect the whole planet from any kind of attack.