A plot could involve Cooler getting trapped in an alternate dimension where the rules of power are different. He has to figure out how to adapt and escape while also facing off against strange new foes. Or perhaps he discovers a long - lost relative who has a connection to Earth, and this forces him to reevaluate his stance on the planet and its inhabitants.
One idea could be to have Cooler return with a new, even more powerful form. He could be seeking revenge against Goku for past defeats. Maybe he's allied himself with a new, mysterious villain from another part of the universe. He arrives on Earth with his newfound power and allies, ready to take on Goku and the Z - fighters in an epic battle that shakes the very foundations of the planet.
One idea could be a story where Goku and Vegeta from Dragon Ball Super end up in the world of Dragon Ball GT by some sort of time - space rift. They then have to team up with the GT versions of themselves to fight a new, powerful enemy that is threatening both timelines.
One interesting Dragon Ball cooler fanfiction could be about a new Saiyan form that is discovered. Maybe it's a form that combines the power of Super Saiyan with the coolness of the Yardratian techniques. In this fanfiction, Goku or another Saiyan character could learn this form from an ancient scroll or a mysterious alien.
One interesting plot idea could be the return of an ancient and powerful villain from the Dragon Ball universe that was thought to be long forgotten. This villain could have powers that even the Gods of Destruction are wary of, forcing Goku and his friends to train in new and extreme ways.
A plot could revolve around a group of underdog fighters in Universe 2 who train in secret to enter the Tournament of Power. They face numerous challenges during their training, including a lack of resources and interference from more powerful groups. But through their determination and unique fighting styles, they manage to make a name for themselves in the tournament.
One idea could be a fanfic where Goku discovers a new form that is a combination of Ultra Instinct and Super Saiyan God. This form gives him unique abilities and a new look. Another idea is to have Vegeta go on a solo adventure to a new planet filled with powerful foes that force him to develop a new fighting style. Maybe also a story where the Z - fighters have to team up with their old enemies like Frieza to fight a greater threat from another dimension.
One idea could be creating a new character who has a unique power that challenges the existing power hierarchy in the Dragon Ball Super universe. For example, a character who can manipulate time in a different way than Whis or Beerus. Another plot could involve a tournament where fighters from different universes have to team up in unexpected combinations. This would lead to new rivalries and friendships. And perhaps a plot where the Dragon Balls are used in a completely different way, like to restore a destroyed universe but with some unforeseen consequences.
One idea could be that a character from Naruto's world somehow gets transported to the Dragon Ball Super universe and ends up in a harem situation. For example, Naruto himself could be sent there and due to his unique abilities and charm, attract the attention of various female characters like Bulma, Android 18, and Chi - Chi. Another plot could involve a new villain who uses the concept of a harem to manipulate characters from both universes, forcing them to work together to overcome this strange threat.
Well, a plot could be centered around Broly's origin. In this fanfiction crossover, it could be revealed that Broly has a connection to an ancient race in a different part of the Dragon Ball universe. Goku and Vegeta discover this and together with Broly, they embark on a journey to uncover the secrets of this race. Along the way, they face various challenges and battles, and Broly has to control his power better to help his new allies.
Perhaps a story where a previously unknown fighter enters the Tournament of Power. This fighter has been training in seclusion and has powers that are a combination of different techniques from various universes. They start off as an underdog but quickly become a force to be reckoned with, making allies and enemies along the way.