In general, a 'chichi x broly lemon fanfic' might attract a lot of attention from fans who are interested in exploring non - canonical relationships in the Dragon Ball series. But it also might face some criticism as it goes against the traditional storylines. The 'lemon' aspect, if it implies something adult - themed, may not be in line with the family - friendly nature of the original Dragon Ball.
One possible theme could be the exploration of an unlikely relationship. Chichi and Broly are very different characters in the Dragon Ball universe, so a fanfic might focus on how they overcome their differences to form a connection.
Bulma could be another character paired with the reborn Broly. She might be the one to help him understand the modern world if he is reborn in a different time period. She could use her intelligence to create devices that help Broly control his power better or she could just be there to provide some comic relief in the midst of all the intense Saiyan drama.
He could team up with Luffy. Luffy is always open to new allies, and Broly's power would be a great addition to the Straw Hat crew. They could go on adventures together and face powerful enemies.
Goku could be a likely ally. Despite their initial conflicts, Goku has a way of seeing the good in people. He might approach Broly and convince him that they can work together to win the Tournament of Power for their universe. Their combined strength would be a formidable force.
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.