In a crossover with One Piece, Luffy could be an ally. Luffy is known for his open - mindedness and ability to befriend almost anyone. He would see Broly's power and might try to get him to join his crew or at least fight alongside him against common enemies. They could have some really fun interactions, like Luffy trying to make Broly laugh or share his love for food with him.
The 'Dragon Ball Super Broly Novel' is an interesting expansion of the Dragon Ball universe. It delves deeper into the character of Broly, his backstory, and his power. It also explores the relationships between the other main characters in the face of this new and extremely powerful adversary. The novel may include more detailed descriptions of the battles, which are always a highlight in the Dragon Ball series.
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.
One possible fanfiction could be about Cheelai's backstory. Maybe she was once a normal Saiyan on Planet Vegeta but was part of a lower - class family. She had to fight hard from a young age to survive. In the fanfiction, it could explore how her experiences on her home planet shaped her into the tough character we see in 'Dragon Ball Super Broly'.
A simple fanfiction idea could be that Broly and Cheelai start training together to become even stronger. They aim to be the top protectors in their part of the universe.