Voldemort is quite common. Since he's the main villain in the original series, fanfic writers often use him to create darker storylines. Bellatrix Lestrange is also popular. Her insane and violent nature gives a lot of room for dark interpretations.
Bellatrix Lestrange can be a significant character in these fanfictions. Since Harry is on a darker path, she might see him as a potential recruit or someone she can manipulate. Sirius Black may also be present, but his role could be one of trying to save Harry from his dark descent, which adds a lot of conflict to the story.
Obviously, Harry Potter himself is very common. He's the central character of the original series, so many fanfics still revolve around him. Hermione Granger is also frequently seen. Her intelligence and strong - willed nature make her a great character to explore in different scenarios. Ron Weasley is another common one, often as part of the trio with Harry and Hermione.
Hermione Granger is quite common. Given her intelligence and strong - willed nature, she often plays a significant role in dealing with marriage law issues. Harry Potter himself also frequently appears as he is a central figure in the wizarding world. Draco Malfoy is another one. His pure - blood status and family's influence make him a key character when it comes to marriage laws that often involve pure - blood traditions.
Harry Potter himself is often a central focus. Since he's the main character in the original series, it makes sense that in time loop fanfics, his experiences in the loop are explored. Hermione Granger is also common. Her intelligence and problem - solving skills are often put to the test in the time loop scenarios. And of course, Ron Weasley, as Harry's best friend, is frequently involved as well.
Voldemort often appears as a sort of 'mentor' figure in some dark path fanfictions. His ideology and power attract characters to the dark side.
However, there could also be new characters introduced. Maybe a mysterious new student who has a connection to the dark side of magic. This character could be a catalyst for the 'dark discoveries' that the story is centered around. They could bring new knowledge or powers that the other characters have never seen before.
Harry Potter himself is very popular. Since he's the main character of the original series, many fanfics revolve around him, either continuing his story or changing certain aspects of it. Hermione Granger is also a favorite. Her intelligence and strong - willed nature make her a great character to explore further. Draco Malfoy is another popular one. Writers often like to redeem his character or explore his inner thoughts and struggles.
Harry Potter himself is often a common character. Since it's a reincarnation fanfic, he could be reincarnated in different forms or with different personalities. Hermione Granger is also frequently seen as she is a very important character in the original series. Her intelligence can play a big role in the new storylines that the fanfic creates.
The Weasley family, especially Molly or Arthur, can be common. They are nurturing figures and can provide a home - like environment for homeschooling. Molly might teach home - ec related magic like cooking spells, while Arthur could share his knowledge of Muggle - related wizardry.
In Harry Potter Dark Arts fanfiction, Voldemort is often a very popular character. His power and his connection to the Dark Arts make him a central figure in many stories. Another popular character is Severus Snape. His complex relationship with the Dark Arts and his dual nature of being both a potential ally of the Dark side and a hero on the side of good add a lot of depth to fanfictions. Bellatrix Lestrange is also popular as she is a fanatical follower of the Dark Arts.