One great fanfic could be 'Frieza's New Ally'. In this story, the male OC has unique powers that catch Frieza's attention. The OC starts as a reluctant partner to Frieza but gradually they form a complex relationship. It has some really exciting battle scenes where the OC's powers are put to the test against other DBZ characters.
One common theme is power struggle. Since Frieza is a powerful villain in DBZ, when a male OC is introduced, there's often a struggle for power or dominance. For example, the OC might have powers that rival Frieza's and they constantly test each other.
One concept could be an OC Frieza Race character who rebels against the tyrannical ways of Frieza. This character might have grown up seeing the cruelty of Frieza's rule and decides to use their powers for good. They could secretly help the oppressed races in the DBZ universe, like the Namekians or the Earthlings.
One good 'DBZ Frieza x OC fanfiction' could be where the OC is a powerful being from a far - off planet and catches Frieza's interest. The OC might have unique powers that Frieza wants to use for his own gain, leading to an interesting power struggle and relationship development. For example, the OC could have the ability to control time, and Frieza tries to force the OC to use it for his galactic conquests.
First, you need to create a well - developed OC. Decide on their appearance, personality, and backstory. For example, if your OC is a warrior, think about what made them become a warrior. Then, consider Frieza's character. He is power - hungry and cruel. Think about how your OC would interact with such a character. You could start with a scenario like the OC being captured by Frieza's forces.
Give them a sense of humor. For example, they could have a dry, sarcastic wit that is unexpected for a Frieza Race. This would set them apart from the typical cold and menacing Frieza Race characters. They might make snarky comments during battles or when dealing with other characters.
One idea could be exploring the Supreme Kai of Time's untold backstories. Maybe she had some secret training or a special encounter in the past that shaped her into the being she is in the DBZ universe.
Frieza might initially be shocked. He's used to being a feared and powerful being, and the idea of having a family is very foreign to him. So he could be in denial at first.
For Yamcha, you can focus on his growth from being a bit of a comical character to a more serious and respected fighter in the context of his relationship with Frieza. Maybe he learns from Frieza's cold and calculating nature how to better strategize in battles. For Frieza, his development could be about him learning to care for someone other than himself. He could start to see Yamcha as an equal, which is a huge shift from his usual superiority complex.