Well, you can develop their relationship gradually. In the beginning, they might be just acquaintances, like when the OC is new to the Drifters' group and Toyohisa is a bit standoffish. But then, as the story progresses, the OC could save Toyohisa's life in a battle. This would make Toyohisa start to see the OC in a new light. Then, they could start training together, which would lead to more interaction and a deeper understanding of each other. Over time, their relationship could grow into a strong friendship and potentially more, like a romantic relationship, as they discover more about each other's personalities and values.
To develop their relationship, start with misunderstandings. Let the OC misinterpret Toyohisa's brash behavior at first. Then, as they get to know each other better, they start to see the real person behind the facade. Have them have deep conversations about their pasts, their hopes, and fears. Also, physical contact can play a role. A simple touch on the arm during a tense moment can be the start of something more. And don't forget about conflict. Maybe the OC's pacifist views clash with Toyohisa's warrior ways, but they learn to respect each other's differences.
A great plot could be that the OC is an artist who can see the auras of the Drifters. Toyohisa's aura is especially strong and mysterious. The OC becomes intrigued by him and starts to follow him around to paint his aura. Along the way, they face various challenges together and their relationship blossoms from a curious one to a romantic one.
A great one often has well - developed characters. It should stay true to the personalities of Toyohisa and Olminu from the original Drifters series. For example, Toyohisa's brave and sometimes impulsive nature should be reflected, while Olminu's intelligence and her unique role in the story need to be maintained.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, and you're likely to find some great Drifters Toyohisa x Olminu fanfictions there. Just use the search function and type in the relevant tags.
To develop their relationship, start with small interactions. For example, the OC could save Halibel from a surprise attack by other Hollows. This would make Halibel curious about the OC. Then, have them exchange stories about their lives. Halibel could talk about her rise to become an Espada and the OC could share their origin story. Another way is to give them a common goal, like protecting a group of innocent Hollows from a cruel Arrancar. Working together towards this goal would bring them closer.
To develop their relationship, start with small interactions. Have the OC offer to help Lucy with her celestial spirit summoning, like finding a rare ingredient for a spirit - summoning spell. Then, they could have some shared experiences, such as getting trapped in a cave during a mission. This forces them to rely on each other, talk, and get to know one another better. Another way is to give them common goals. For example, they both want to defeat a certain dark mage who has been causing trouble in the area. Working towards this goal together will bring them closer.
You can start with them having a bit of a rocky start. Maybe Alex is too brash for the OC's liking at first. But as they face challenges together in Jumanji, they start to see the good in each other. For example, Alex's courage impresses the OC during a fight with a game - created monster, and the OC's intelligence helps them solve a difficult puzzle, earning Alex's respect.
It could start with Ironhide showing simple kindness to the OC. Just small acts like making sure they have food or a safe place to stay. This can gradually build into a deeper emotional connection.
Writers can start by building a strong initial encounter. Maybe it's a chance meeting in a dangerous situation where Emmett saves the OC. This creates an instant bond. Then, through shared experiences like exploring the forest together or Emmett teaching the OC about vampire lore, their relationship can grow.
As the OC's pregnancy progresses, Itachi may find himself changing his priorities. He might start to think more about a peaceful life with the OC and the baby. This could lead to a shift in their relationship from just being two individuals in love to a family - in - the - making. They could start making plans for their family, like choosing a name for the baby, which would bring them closer together.
Start with small interactions. For example, they could exchange simple greetings in OZ. Then gradually, have them team up for small tasks in the virtual world, like competing in a mini - game. This will build a sense of camaraderie.