One idea could be that the OC is a time - traveler who accidentally lands in Caulifla's universe. The OC has unique powers that Caulifla is intrigued by, and they start training together. This could lead to a friendship that slowly turns into something more as they face various challenges together in the tough Saiyan - filled world.
Perhaps the OC is a healer from a different planet. Caulifla gets seriously injured during a battle, and the OC comes to her rescue. As Caulifla recovers, she discovers the OC's gentle nature which is a contrast to her own warrior - like personality. They bond over their differences and start a relationship that defies the norms of their respective cultures.
One idea could be Caulifla traveling through time. She could end up in the past during the Saiyan - Vegeta wars and have to decide whether to interfere or not. Another could be Caulifla getting trapped in a magical realm where she has to fight strange creatures with unique powers to find her way out. Maybe she could also form an alliance with an unexpected character, like a villain who has a change of heart.
Well, perhaps the OC is a master of a rare form of martial arts. Caulifla, being the battle - hungry Saiyan - like character she is, challenges the OC. During the fight, the OC shows not only great combat skills but also a sense of honor and justice. This catches Caulifla's attention. Later, they find themselves on the same side against a common enemy and their relationship blossoms from there. They could also have cultural exchanges, as the OC might come from a very different culture within the One Piece universe.
Maybe in the fanfiction, they discover a new threat to the universe together. Caulifla's determination and Gohan's intelligence would be crucial in figuring out how to defeat this new enemy. They could start off as rivals, not trusting each other at first, but as they face the challenges, they grow to respect and eventually fall in love with each other.
Perhaps a story where Caulifla and Goku are on a mission together in an unknown planet. They face various challenges and have to rely on each other's strengths. Caulifla might initially be overconfident, but Goku's experience helps her to understand the importance of strategy and teamwork. Along the way, they start to respect each other more deeply.
A plot could involve Caulifla being from a parallel universe where she is the only survivor of her race. Goku meets her during a multiverse tournament and decides to help her. As they train and fight side by side, they develop a deep bond that goes beyond friendship and they explore their new relationship while facing various challenges from other universes.
A plot could be Cabba confessing his feelings to Caulifla. He might be nervous at first, but after a big battle where they protect each other, he finds the courage. This would create a new dynamic in their relationship.
One idea could be that the OC is a healer who stumbles upon Frankenstein's monster in the woods. The OC decides to help the monster, despite the danger, and they form an unlikely bond. This could lead to a story of redemption for the monster and a journey of self - discovery for the OC.
Maybe the OC is a scientist who has developed a device that can temporarily steal The Flash's speed. At first, the OC uses it for personal gain, but then realizes the chaos it's causing in the city. They then team up with The Flash to take down other villains who are after the device. Or, the OC could be a meta - human with the ability to see the future in flashes. The Flash initially doesn't trust the OC, but as they start to have the same visions, they have to work together to prevent a major disaster from happening.
The OC could be a psychic who is unknowingly drawn to Derry because of Pennywise's presence. Their psychic powers allow them to sense Pennywise's energy but not fully understand what it is at first. As Pennywise tries to manipulate the OC, the OC starts to fight back using their psychic abilities, creating a battle of wills and powers that could span across different dimensions within Derry, from the sewers to the abandoned houses and the mindscapes of both characters.
The OC could be a researcher studying digimon behavior. Renamon becomes the subject of the study. At first, Renamon is very guarded around the OC. However, as the OC shows genuine respect for Renamon and her kind, Renamon begins to open up. They then embark on a journey to discover more about the history of digimon, with their relationship growing stronger along the way.