In a fanfiction, the Emperor could be interested in the magic of Garry Potter's world. He might send his minions to study it and try to incorporate it into his own power base. This could lead to a story where Garry Potter and his friends have to defend their world's magic from being exploited by the Emperor. They could team up with some of the good guys from Star Wars, like the Jedi, who could also be intrigued by this new form of power.
One way to combine them is by creating a crossover universe. Imagine if the magic from Garry Potter's world collided with the technology and diverse species of Star Wars. The Emperor could be a powerful dark wizard in this new universe, using both Sith powers and magic spells. Maybe he could rule over a hybrid empire of wizards and Star Wars species, using his dark arts to control both magic and the Force.
Well, you could have a fanfiction where Garry Potter (assuming it's a character named Garry Potter) is somehow transported to the Star Wars galaxy. He meets the Emperor and they engage in a battle of wits and powers. Garry could use his knowledge of magic to counter the Emperor's use of the Dark Side of the Force. For example, he might use a spell to disrupt the Emperor's lightning attacks or use a magical shield against the Emperor's Sith mind tricks.
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