Her old Hogwarts friends would be very likely customers. They would come to support her new business and also to relive their old memories together. Hermione would probably come often to discuss books and new spells while having a drink.
Muggle - born wizards might be regulars too. Female Harry could create a special area in the bar where they can feel comfortable sharing their experiences of adjusting to the wizarding world. It could be a place for them to bond over their unique journey from the muggle world to the magical one.
Other young wizards and witches starting out in the wizarding world could be her customers. They might be attracted by the unique atmosphere of the bar and the chance to hear stories from someone as famous as Harry (even if it's female Harry). It could be a place for them to network and make new friends.
His old friends from Hogwarts would surely be regulars. Ron and Hermione would be there often. Neville might come to relax after a day of teaching Herbology at Hogwarts. Luna could drop by to share her latest theories about magical creatures while sipping on a strange - looking drink. Hagrid might also be a regular, though he'd need a special - sized chair.
The regular customers could be Naruto's friends from the ninja academy. They would come to the bar to relax and catch up on old times. Also, other ninjas from the Hidden Leaf Village might stop by after a long mission.
His Hogwarts friends would probably be the first. Hermione would be eager to check out any new books or intelligent - enhancing potions. Ron would be interested in any food - related magical items, like everlasting candies.
I think magical creatures would also be customers. Maybe house - elves would be sent to pick up treats for their wizarding families. Hippogriffs might be lured by some special bird - shaped pastries. And even centaurs, if they were feeling a bit more adventurous, could come to the edge of the Forbidden Forest where the bakery might be located to get some goodies.
Ninjas, of course! They would come to relax after a long day of training or missions. Also, fans of the ninja world from within the story would be there. Maybe even some of the village leaders would stop by to show support for the local business.
Other potion shop owners might visit too. Not as customers in the traditional sense, but more to check out the competition. They might be curious about Harry's unique potions. And then there are the local wizards and witches in the area where the shop is located. They could need potions for daily life, like a potion to make their gardens grow better or a potion to keep their pets healthy.
Definitely Hogwarts students. They'd come during their free time or on trips to Hogsmeade. They'd be eager to try Harry's special magical treats.
Well, the regular customers could include some of Harry's old friends from Hogwarts, like Ron and Hermione. They would support Harry's business and enjoy the unique atmosphere. In addition to that, supernatural hunters from the Supernatural world might stop by. They could be looking for information about certain supernatural beings that might be lurking around the bar. And of course, there would be the local supernatural community, such as witches and warlocks who are not directly related to Hogwarts but are interested in the mix of magic and the new - found supernatural elements in the bar.
It could be a magical creature - themed bar. Since Harry has a lot of experiences with magical creatures in the original story. For example, there could be pictures of hippogriffs on the walls and butterbeer with a special magical creature - shaped ice cube in it.
One possible plot could be that Harry uses his magical knowledge to create a bar with unique magical drinks. For example, he might serve Butterbeer with an extra kick of magic, or a potion - like cocktail that gives temporary magical abilities. He could also use the bar as a place for magical creatures and wizards to mingle, creating a new social hub in the wizarding world.