Basilisks are also a favorite. They are such a fearsome and mysterious monster. Fanfiction could focus on the basilisk's origin or perhaps a new encounter with a basilisk that is different from the one in the Chamber of Secrets. Maybe there are other basilisks hidden in Hogwarts that are awakened by dark magic.
The dementors are often used. They are so dark and menacing. In fanfiction, they could be given more backstory or a different role. For example, a story could explore if the dementors were once humans who were cursed and turned into what they are now. And how they might be redeemed or controlled in a different way.
The werewolves are quite popular. Remus Lupin's story has a lot of potential for further exploration in fanfiction. Writers can create more werewolf characters or expand on the werewolf community.
Sulley and Mike are definitely the most popular. Sulley is the big, furry blue monster who is the star scarer, and his relationship with Mike is really fun to explore in fanfiction. Boo is also very popular as she is the cute human girl who befriends the monsters.
One possibility could be centaurs. Centaurs are intelligent and have their own code of ethics. They could raise Harry with a deep understanding of nature and the stars, which would give him a different kind of wisdom.
In this fanfiction, the 'Father of Monsters' might be an ancient wizard who has been in a deep slumber for centuries. He was awakened by some disturbance in the wizarding world and, feeling angry about the changes that have occurred, decides to create monsters to bring back what he believes was the 'true' order of the wizarding world. His knowledge of old magic gives him the ability to create extremely powerful and dangerous monsters that no one has ever seen before.
The Missing Link is also quite popular. His brash and confident personality can add a lot of humor and action to a fanfic. He could be on a quest for glory or trying to prove himself to the other monsters.
The Box Ghost is quite popular in Danny Phantom fanfiction. He's often used as a comical relief character, but can also be made into a more menacing figure in some stories. Another popular one is Skulker. His hunting nature and advanced weaponry make him an interesting character to write about. He can be a formidable foe for Danny or even an unexpected ally in certain situations.
Monsters can also be used to explore different aspects of the wizarding world's magic. Their unique abilities can lead to new magical theories or explanations in fanfiction. For example, how the magic used to control a certain monster might be related to an ancient and forgotten branch of magic.
Some of the rare and powerful monsters can also be considered popular characters. Like the mythical dragon - type monster, which has the ability to control elements. Fans love to write about it, either as a fearsome adversary or a loyal companion.
Harry Potter himself is often a central figure. Writers like to explore different aspects of his character, such as his life after defeating Voldemort in more depth. They might create scenarios where he has to face new threats or deal with the long - term consequences of the war.
Luna Lovegood is also a favorite. Her unique view of the world can add an element of surprise in fanfiction. In a story with 'The Originals', she might befriend some of the witches in the Mikaelson family, sharing her strange but profound knowledge of magic.
Hermione is often popular. Her intelligence and strong - willed nature can be interestingly combined with the Glee characters. Also, Harry Potter himself. His status as a hero in his own world can create some cool storylines when paired with the Glee gang.