Hermione could also be a main character. She is known for her intelligence and research skills. In a fanfiction, she could be the one researching the history of the snake staff, trying to understand its true nature and powers, and using her knowledge to either protect it from falling into the wrong hands or to unlock its potential for good.
The main character is Harry Potter without a doubt. However, new characters can also be introduced in these fanfictions. For example, there could be a local wizard or witch in the place where Harry is exiled who becomes his friend or mentor. This new character can have their own backstory and motives. They could teach Harry about the local magic or help him adapt to his new environment, adding a new dimension to the story.
Hermione could be a main character in 'Harry Potter snake transformation fanfiction'. She's known for her in - depth study of magic, so she might be trying to find a way to reverse or understand the transformation. Ron could also be involved, perhaps as the friend who is trying to help the transformed character. And then there are the various Hogwarts professors who could play important roles, like Professor Snape who has his own secrets and knowledge of the Dark Arts.
Another character that might be involved is Bellatrix Lestrange. As a devout follower of Voldemort and a member of the Black family, she could have complex relationships with Lady Black. Maybe in some fanfictions, Lady Black has to deal with Bellatrix's extreme actions and how they reflect on the family name.
Well, aside from the obvious ones like Harry and Hermione, Luna Lovegood can be a main character in some 'Harry Potter Master Legilimency' fanfictions. Her unique perspective on magic could lead to some interesting takes on Legilimency. Sirius Black is also a character that might be involved. He was a member of the Marauders and could have passed on some knowledge about Legilimency. And then there's Dumbledore. Given his vast knowledge and power, he could be guiding the main characters in their Legilimency studies or using it in his grand plans for the wizarding world.
One interesting fanfiction could be about the origin of the snake staff. Maybe it was a powerful dark wizard's creation long ago, and the story could explore how it ended up in the hands of certain characters in the Harry Potter universe.
Hermione is often a main character in these fanfictions. Given her love for learning and thirst for knowledge, it's easy to imagine her exploring the intersection of science and magic.
Harry Potter himself is often involved. He might be the one to encounter the first signs of inflation, whether it's a magically inflating potion or an enchanted object. His friends, like Ron and Hermione, are also likely to be part of the story, helping him figure out what's going on.
Ron Weasley could also be a key figure. He might be Harry's loyal friend as always, standing by his side during all the changes that Harry is bringing about in the wizarding world as a god. And there could be new characters introduced as well, perhaps other gods or magical beings that interact with Harry in this new fanfiction realm.
In some cases, Albus Dumbledore could play an important role. His wisdom and power in the wizarding world would make him a key figure in any situation where the two different universes collide. He might be the one to first discover Alexstrasza's presence and figure out how to make use of her abilities in the fight against the dark forces in the Harry Potter world.
Obviously, Harry Potter himself is always a main character. He is the one most directly associated with the concept of death in the original series, what with his parents' death and his multiple near - death experiences.