An American wizard detective. He could be investigating strange magical happenings in the wizarding world of America. The Potter character could cross paths with him and end up teaming up to solve a big case.
A young and curious wizard could be added. This wizard could be intrigued by the devil's unbreakable nature and try to study it, leading to some interesting interactions. Another character could be an angel who has lost its way and forms a strange bond with the devil. Or perhaps a talking animal, like a raven, that serves as the devil's confidant and gives it advice from a different perspective.
A magical creature in human form. This could be a centaur who has the ability to transform into a human for a short period. They could be a mysterious figure in the 'Magical Me' fanfiction, perhaps having a hidden agenda or being a guide to the main character in a dangerous situation.
A mysterious old Pokemon trainer who has a lot of knowledge about ancient Pokemon moves. He could guide Rusty on his journey.
A group of nomadic mice. They have different skills and traditions compared to the Redwall mice. Their arrival at the abbey could cause some cultural clashes at first, but eventually, they could learn from each other and contribute to the abbey's growth. This would add more diversity to the characters in the fanfiction.
A young stargazer from Earth could be a new character. This character could be someone who has always been fascinated by the stars and dreams of traveling to other planets. When the Little Prince lands on Earth again, they meet and the stargazer becomes his guide on Earth, showing him all the new things that have happened since his last visit. Another potential character could be a talking moonbeam. It could offer the Little Prince advice and wisdom, as well as some magical abilities to help him on his journey.
A new character could be a therapist who has a unique approach to helping the main character. This therapist could introduce new ideas and methods of healing that the main character hasn't encountered before.
A healer from a far - off land could be an interesting addition. This character could bring in new knowledge of magic and medicine that the existing characters are unaware of. Maybe they have a special connection to nature that allows them to heal in ways not seen before in the story.
A young Martian inventor could be a great addition. This character could create unique gadgets and machines that help the protagonists in their adventures. For example, a flying device that can travel at high speeds across Mars.
A mysterious traveler passing through the town could be a new character. This person has seen many strange things in their travels and is not afraid of Edward. In fact, they see his potential and encourage him to leave the town and see the world.
In a 'Percy son of Hades fanfiction', there are many characters that could be added. For example, Charon, the ferryman of the Underworld. He could play a role in Percy's travels within the Underworld. Persephone could also be an important character. She might be initially suspicious of Percy but then come to see his potential. Additionally, the Erinyes, or the Furies as they are more commonly known, could be added. They could be a source of conflict or assistance for Percy, depending on the situation.