Yes, there are likely 'Bardock Kills Frieza' fanfics out there. The Dragon Ball universe has a huge fan base, and many fans like to create alternative storylines. You can try searching on fanfic websites like FanFiction.net or Archive of Our Own.
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.
The plot could start with Bardock having a premonition of Frieza's future actions against the Saiyans even before the destruction of Planet Vegeta. He then secretly trains and discovers a new form or power that allows him to stand up to Frieza. When Frieza arrives to destroy the Saiyans, Bardock reveals his newfound strength and battles Frieza. After a long and intense fight, Bardock manages to defeat and kill Frieza, changing the course of the Dragon Ball universe. This could also lead to new alliances and power struggles among the remaining 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.
There are fanfictions where Vegeta has a spiritual awakening of some sort. He realizes his true potential and his connection to the Saiyan pride. This newfound power allows him to generate a massive energy field around Frieza. The energy field then compresses in on Frieza, crushing him from all sides until he is completely destroyed. This method not only shows Vegeta's power but also his growth on a more spiritual level.
Their relationship could grow deeper as they face the challenges of pregnancy together. Krillin might become more in tune with 18's needs, and 18 could see a new side of Krillin's caring nature.