Well, one key event is Goku's early battles against various foes. He faces off against enemies like Raditz. Another important part is his training and growth in power during this part of the story.
A plot could revolve around a time - traveling character who goes back to the time of the Tenkaichi tournaments in Dragon Ball Z. This character could accidentally change some events, leading to a whole new set of battles and power - up scenarios. Maybe Goku doesn't get the senzu beans he needs at a crucial moment, forcing the other fighters to step up more.
Vegeta is also highly popular. His pride and his journey from villain to anti - hero are rich areas for fanfiction. Writers can delve into his internal struggles, like his constant need to prove himself stronger than Goku while also dealing with his new - found family on Earth.
A common reaction in fanfiction about Dragon Ball Super Broly is shock at his raw power. Many fans write about how other characters, like Goku and Vegeta, react when they first see Broly's incredible strength. For example, Goku might be excited to face such a powerful opponent, seeing it as a new challenge in his quest for greater strength.
In some fanfictions, the reactions of the villains to the power - ups of the heroes can be really engaging. For example, Frieza seeing Goku's Ultra Instinct for the first time. He could be both terrified and intrigued, which might lead to different strategies in their battles. Also, the reactions of the Earthlings who are not fighters, like Bulma or Master Roshi, when they see the insane power levels during a fight. They might be worried for their friends but also excited to see the display of such power.
There are fanfictions that focus on the reactions of minor characters. For instance, the reactions of the people on Earth when Cell is about to self - destruct. Some might be resigned to their fate, while others are desperately hoping for a miracle. Also, reactions to Bulma's inventions can be quite interesting. Her time - travel machine or the capsules she creates can cause all sorts of reactions among the characters.
There is a fanfiction about reactions to the arrival of Broly in the Dragon Ball Super timeline. It showed not just the Saiyans' reactions but also how other races in the universe perceived this extremely powerful Saiyan. It was full of action and emotion as different characters tried to figure out what to do about Broly.
The popularity also comes from the fact that it can expand the universe. Fanfiction writers can create scenarios where characters react to things that might not have been fully explored in the original. They can show how the people on Earth react to the new threats from other universes in Dragon Ball Super, which adds more realism to the story.