It could lead to a completely different character arc and story development. Maybe she'd have a softer side or face different challenges due to gender expectations in the Dragon Ball universe.
The key elements include his high power level at birth. This led to his exile by King Vegeta. Another element is his father, Paragus, who was with him during his exile. Also, the sense of betrayal and revenge that developed in Broly due to his exile is a major part of his back story.
If Broly joined the Tournament of Power, it would be an absolute game - changer. His raw power is off the charts. He could easily take on multiple opponents at once. He might start by targeting the strongest foes, like Jiren. His uncontrollable rage could work in his favor, as opponents would be intimidated. However, his lack of teamwork skills could also be a drawback. But with his power, he could probably just brute - force his way through many battles.
Since Broly is a character from the Dragon Ball franchise, if there is a 'Broly Love Story', it might involve him finding love among the various races in the Dragon Ball universe. Maybe he meets a female Saiyan or someone from another planet and they form a connection through shared experiences, like fighting together against a common enemy. But again, this is all speculation as it's not a common part of the official story.
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.