One of the characters he could meet is Princess Leia. She would be curious about Harry and his abilities. They could work together to plan an escape or a rebellion within the Death Star. Chewbacca could also be there. Harry might be a bit scared of Chewie at first, but then they could become friends. And of course, there are the countless Stormtroopers. Harry would have to deal with them, either by using magic to avoid them or by fighting them if necessary.
Obviously, he could meet Darth Vader. Their encounter would be really interesting as they are from two very different fictional universes. He might also come across Luke Skywalker. They could form an alliance, with Harry sharing his knowledge of magic and Luke sharing his skills with the Force. Another character could be Han Solo. Harry would be amazed by Han's piloting skills and Han would be intrigued by Harry's magic.
He could meet the main characters from Death City. For example, Maka Albarn and Soul Eater Evans. They could be initially cautious around Harry but then become friends as they realize his good intentions.
There could be new types of magical creatures that have evolved or been discovered by 2110. Harry might interact with them, and they could either help or hinder his mission.
He could meet Bella. Since Forks is Bella's hometown in the 'Twilight' series. They might become friends or have some kind of adventure together.
Sakura might be one of the characters. She has her own set of skills in the medical and combat fields. Meeting Harry could lead to exchanges of knowledge about different forms of healing and combat magic.
He could meet an Egyptian wizard who is an expert in ancient magic. This wizard could teach Harry a great deal about the history of magic in Egypt.
Some potential characters could include Fleur Delacour. She's beautiful and has her own brand of magic. Cho Chang could also be part of it. And what about a new character, a mysterious witch from a hidden wizarding village? She could bring in new elements to the harem, like a different type of magic or a unique personality trait.
He could meet Yugi Moto. Yugi is a key figure in Domino City and his connection with the spirit world might be really interesting to compare with Harry's magic. Also, he might run into Joey Wheeler, who could be either fascinated or a bit skeptical about Harry's magical powers.
He could meet American wizards and witches. Maybe there's a young and enthusiastic wizard who becomes his guide in America, showing him around the American magical communities.
Well, perhaps Harry could be using his magic skills to outwit the Stormtroopers. Maybe he's on a mission to find a powerful magical artifact that has ended up on the Death Star by some strange magic. He might use spells like 'Expelliarmus' to disarm the imperial soldiers and his invisibility cloak to sneak around the Death Star's corridors.
Perhaps Neville Longbottom could take on this role. He has shown great courage throughout the series. His experiences with loss, like the death of his parents, could lead him down a path where he becomes the apprentice of death, using his newfound powers to protect others and bring a new balance to the wizarding world.