Dumbledore might also be a significant character in some of these fanfics. Even though he is not a Potter, he has a strong connection to the family. He could be involved in setting up or enhancing the protections of the Potter house. And then there are the family's house - elves, who play a role in maintaining the house and its protection, and can sometimes be important characters in their own right.
Often, Harry Potter himself can be a main character in such fanfics. Imagine him with the ability to shapeshift, which could give a new twist to his battles against Voldemort. He could transform into a snake to spy on the Death Eaters, for instance.
In these fanfics, Harry Potter is typically a central figure. He could be on a quest that takes him to the Spartan realm. Ron Weasley might tag along too, providing some comical relief while also being involved in the adventures. From the Spartan side, a strong and noble Spartan leader or hero would be present. This character would be intrigued by the magic that Harry and his friends bring and would want to learn more about it. They would all interact in various ways, facing challenges together.
One interesting storyline could be about the discovery of long - lost Potter family secrets. For example, a hidden magic that was lost for generations but is now being rediscovered within the protected walls of the Potter house in the fanfic. Another could be the training of a new generation of wizards by the Potter family, with unique spells and magical techniques being passed down.
Harry Potter himself is often involved. He might use his experiences and knowledge to contribute to the rebuilding. Hermione would also be there, using her vast knowledge of magic and research skills. Ron could be involved too, providing his practical wizarding skills and humor. Neville might also play a part, especially when it comes to the rebuilding of the greenhouses or any part related to Herbology.
There could also be a mysterious pokemon trainer who has a special ability to hypnotize pokemon. This character might be a bit of an enigma, with motives that are not clear at first. They could be either a villain trying to use hypnosis for their own gain or a misunderstood character who is actually trying to help pokemon in a different way through hypnosis.
Obviously, Harry himself is a main character. Then there are often Hufflepuff students like Cedric Diggory. He's a significant character as he represents the best of Hufflepuff - being brave, kind, and fair. Newt Scamander could also be included in some fics as he was a Hufflepuff. His knowledge of magical creatures can add an interesting element to the fanfic.
One main character could be a half - blood who has some knowledge about changelings. They act as a sort of mentor to the changeling main character. There might also be a house - elf who befriends the changeling. The house - elf could offer a different perspective on the wizarding world and help the changeling in times of trouble. Additionally, a magical creature like a centaur might play a role, as they are known for their wisdom and might be able to give the changeling some important advice.
Often, you'll find the slayer as a main character, of course. They bring their own set of skills and a different perspective to the wizarding world. Harry Potter himself might also be a main character, as the two could interact and collaborate in the fight against evil. Hermione would also be a likely character, her intelligence and knowledge of magic could be combined with the slayer's brute force and unique abilities.
The midwife herself is often a main character. She could be an original character created by the fanfiction writer, with her own backstory and magical abilities related to midwifery.
Often, Harry Potter himself can be a main character. Picture him learning programming skills from a mysterious Muggle - born wizard and using it to his advantage against Voldemort. Another common character could be Hermione. Since she is so intelligent and loves to learn new things, it's easy to imagine her delving into programming in a fanfiction story.