Another possible storyline is that the balloons are actually a new threat to the Dragon Ball universe. They start multiplying uncontrollably and causing chaos. 18, with her strength and intelligence, teams up with the other Z - fighters to find a way to stop the balloon invasion. They might have to travel to different planets to find the source of the balloons and a way to destroy them.
One interesting piece of Dragon Ball balloon fanfiction could be about a new character who uses balloons in a unique fighting style within the Dragon Ball universe. Maybe they create balloon animals that can attack or defend, adding a really creative and fun twist to the battles we know from Dragon Ball.
One common theme could be transformation. Just like in the original Dragon Ball series where characters transform to gain more power, in balloon fanfiction, they might transform using balloons in some way. For instance, a character could be surrounded by balloons and emerge in a new, more powerful form.
One interesting storyline could be Goku and Android 18 teaming up to fight a new, powerful enemy that neither of them can defeat alone. They have to learn to combine their skills and powers in unique ways.
A more action - packed storyline could be Chichi getting kidnapped by an old enemy of Goku. Goku then has to race against time to save her. Along the way, he might face some new and powerful foes. Goku's determination to save his beloved Chichi would be the driving force of this exciting story.
One interesting storyline could be a new character created by a gamer who has unique abilities that even the Saiyans are envious of. This character might enter the Dragon Ball Super universe and start competing in the tournaments, creating new rivalries and alliances.
One interesting storyline could be Trunks and Pan going on a time - traveling adventure together. They might visit different eras in the Dragon Ball universe and face various challenges that were not part of the original story. For example, they could end up in a time when the Saiyans were still on Planet Vegeta and have to figure out how to get back home without disrupting the timeline too much.
One interesting storyline could be an OC who is a Saiyan from a lost colony. They come to Earth seeking answers about their heritage and end up training with the Z - fighters. They might have unique powers that are a blend of traditional Saiyan abilities and something new, like the ability to manipulate energy in a different way than Goku or Vegeta.
An OC that has a special connection to the Namekians but also has a hidden dark side. This could be a great storyline as the Z - fighters initially see the OC as an ally due to the Namekian connection, but then have to deal with the OC's darker tendencies which could be triggered by certain events or characters in the Dragon Ball world.
One interesting storyline could be Android 21's struggle to find her true identity. In fanfiction, she might discover that she has a hidden past or purpose that was not initially known in the original series.
One interesting storyline could be about a new and powerful character emerging in Universe 9. This character might have a unique ability that challenges the existing power hierarchy. For example, they could control a type of energy not seen before in the Dragon Ball universe.