Obviously, Harry would be one of the main characters since it's in the title that he uses the two - way mirror. There might also be other characters like his friends Hermione and Ron. They could be involved in the story, either helping Harry with the mirror or being affected by what he discovers through it.
One interesting aspect could be how Harry uses the two - way mirror in a unique way. Maybe he uses it to communicate secretly with someone, like a friend or a mentor. It could also add an element of mystery to the story as the mirror might show things that are unexpected or hidden.
The villain in the fanfic could also be considered a main character. If Naruto is using Shiki Fuujin, it's probably against a powerful enemy. This enemy's motives and power level would play a crucial role in the story and how Naruto decides to use the jutsu.
Obviously, Harry Potter is one of the main characters. He is the one using the family magic. There might also be his friends like Hermione and Ron. They could be involved in helping Harry discover and master the family magic. And perhaps some of Harry's family members, either from the past or present, could also be main characters as they are related to the family magic.
There could be other characters too. Dumbledore might make an appearance, as he has a deep understanding of the Mirror of Erised. He could be guiding Hermione and Ron from the outside. Additionally, there might be some original characters created by the fanfic author. For example, a mysterious wizard who has some connection to the mirror and its magic. This character could either help or hinder Harry's journey back to his world.
Well, of course, Harry Potter himself is often the central figure. His friends Ron Weasley and Hermione Granger usually tag along. Neville Longbottom might also be there, as he becomes more and more part of their group as the series progresses. Sometimes Luna Lovegood joins in with her unique and dreamy perspective on magic, which can add a lot of fun and quirkiness to the vacation adventures.
Harry Potter himself is often involved. Since he's the main character in the original series, he's likely to be in spider - related fanfics too. Hagrid is also common as he has a connection to the Forbidden Forest where many spiders live. Hermione might be involved as she's always eager to solve mysteries and learn about new magical creatures, and a spider - centered fanfic could present a new mystery for her to solve.
Besides the well - known characters from the original books, some fanfics might introduce new characters in the shopping scenarios. For example, a young wizard or witch who is just starting at Hogwarts and is on their first big shopping trip. They could interact with the more established characters like Harry and Hermione, learning from them about the different shops and what to buy. This new character can bring a fresh perspective to the familiar shopping setting in the wizarding world.
Harry Potter himself is often involved. He might be curious about the droid and its abilities, and try to figure out how to use it to his advantage in the fight against Voldemort. Hermione is also a common character. She would probably be the one to study the droid's technology and try to find a way to integrate it with magic. Ron could be there too, perhaps being a bit skeptical at first but then coming around when he sees the droid's usefulness.
Harry, Hermione, and Ron are often involved. Since they are the main characters in the original series, it's natural for them to be part of these fanfics. For example, Harry might be the one with the strange sneezing issue that sets the plot in motion.
In this fanfic, Harry is the main focus as he's the one sent to Azkaban. However, other characters would also be important. The guards at Azkaban, the Dementors, would be key figures as they would be the ones constantly menacing Harry. Then there are the Ministry of Magic officials who were involved in sending Harry there. Their motives and actions would be crucial elements in the story.