One common theme is the clash of cultures. Harry Potter's world is full of magic based on spells, potions and wands, while Broly comes from a world of physical strength and power - ups. So, seeing how these two different power systems interact is a big theme.
Some fan fictions may put Jaiden in a crossover scenario. Like she enters the world of a popular video game and has to adapt to the game's rules and characters. She could use her knowledge of animation to outwit the game's villains and make new friends among the game's inhabitants.
There's a fan fiction titled 'Broly in Hogwarts'. In this, Broly somehow gets transported to Hogwarts. It details his confusion at first, as he's used to his own universe. But then he starts to adapt and uses his strength to help the students when the school is in danger. It's really exciting as it shows the clash and then the cooperation between two very different universes.
First, you need to know Jaiden's style and the themes she often explores in her animations. Then, come up with an original idea that could fit within the world she has created. For example, if she often does slice - of - life animations, you could start with a simple day in her life but add a unique twist.
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.