There could also be some within the wizarding community who oppose Harry learning the Unforgivables. They might see it as a sign that he is turning to the dark side and try to stop him, so they could act as antagonists in the story.
Well, perhaps we can expect to see Harry's moral struggle as he delves into the knowledge of the Unforgivable Curses. It could show his reaction to the dark magic associated with them.
In this fanfic, perhaps Harry gets into a situation where he has to become a cursebreaker to save someone he loves. He starts from the very basics, learning about the history of curses and how they have evolved over time. He then embarks on a journey to various places in the wizarding world, seeking knowledge from different sources. As he progresses, he not only becomes a skilled cursebreaker but also gains a deeper understanding of the darker aspects of magic.
It could be about Harry Potter learning some long - forgotten or lost magical arts. Maybe he discovers ancient spells, potion - making techniques that have been lost for centuries, or unique forms of divination that are no longer practiced in the wizarding world.
In the 'Harry Learns Alchemy' fanfic, Harry is the central figure. He is on a journey of learning alchemy. Hermione would be a key character as she is very studious and would be eager to help Harry understand the complex concepts of alchemy. There could be a mysterious old wizard who acts as a mentor to Harry in his alchemical studies. And Ron, as Harry's best friend, would be around, maybe not fully understanding alchemy but being supportive in his own way.
It might be a story where Harry delves into the family magic in order to solve some sort of mystery. For example, he could be looking for a way to defeat a new dark force and realizes that the family magic holds the key. He could learn new forms of magic related to protection or divination that are unique to his family.
There could be his arithmancy teacher as a main character too. This teacher might be strict but also very knowledgeable, guiding Harry through the difficult subject.
The 'harry learns the old ways fanfic' is likely centered around Harry's exploration of archaic knowledge or practices. It could be that he discovers an old library filled with dusty tomes that hold the secrets of the old ways. As he reads and learns from these, he might start to incorporate these old ways into his daily life in Hogwarts or his battles against the dark forces. He could learn things like how wizards used to communicate without wands, or ancient forms of defensive magic that have been long forgotten by most in the modern wizarding world.
One possible consequence is that Harry becomes an even bigger target for Voldemort. Since a Horcrux is important to Voldemort's immortality, he'd be more determined to get to Harry. Also, Harry might start to experience some strange effects on his soul or magic due to being a Horcrux.