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.
You could also write a fanfiction where Cooler discovers a hidden power within himself that was unlocked by an ancient artifact. This power makes him not only stronger physically but also gives him new abilities like the power to manipulate time on a small scale. He uses this new power to try and rewrite history, to make himself the dominant force in the universe from the very beginning. But Goku and his friends, with the help of the Dragon Balls, must stop him before he destroys the fabric of time itself.
Let him experience growth. Have him face challenges that force him to change his perspective. Maybe he meets a character who is so pure - hearted and kind that it makes him question his own values. Through interactions like this, he can gradually transform from a one - dimensional villain to a multi - faceted character with his own internal struggles and growth in the Dragon Ball Super fanfiction.
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.
To develop Cooler further, he could be given a redemption arc. Maybe he starts off as a villain but gradually realizes the error of his ways. He could befriend some of the younger Z - fighters who look up to him despite his past. This would force him to be a better role model and in the process, he would change and become a more complex and interesting character.
The allure lies in the fact that we can see these two powerful villains in new situations. In fanfiction, they might interact with characters from other universes, which is really cool. It expands the Dragon Ball Z universe in ways the original didn't.
One great 'Dragon Ball Z Cooler' fanfiction is 'Cooler's Redemption'. It explores a scenario where Cooler decides to change his ways and ally with the Z - fighters. The story has well - written battles and character development.
Fanfiction also allows for different endings to their stories. Instead of their fates in the original series, they could be redeemed in some fanfictions. Picture Frieza actually learning to care about others and using his power for good. It's a different take on their characters that fanfiction can offer.
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.
Future Trunks is another favorite. His time - traveling adventures and his unique place in the Dragon Ball timeline allow for some really creative fanfiction. He can bring knowledge from the future to the past, or he can get stuck in a different timeline and have to find a way back, creating all sorts of interesting plot twists.
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 idea could be Gohan in his Super Saiyan 4 form facing a new, powerful enemy from another dimension. He could struggle at first to control the raw power of this form while also trying to protect his friends and family. Maybe this new enemy has the ability to nullify the Saiyan's energy attacks, forcing Gohan to rely more on his martial arts skills that he learned from Piccolo.