Yes, there are likely some fanfics out there with such a premise. The Harry Potter fandom is vast, and fanfic authors often come up with unique and creative ideas. However, you might need to search through various fanfic platforms like Archive of Our Own or Fanfiction.net to find one specifically with this concept.
One common theme is self - discovery. Since Harry is a squib, he has to find his place in a magical world that he doesn't quite fit into in the traditional sense. Another theme is the relationship between Severus and Harry. Severus, as a potion master, might take Harry under his wing or have a complex relationship with him due to his status as a squib. Potions often serve as a medium through which their relationship develops or conflicts arise.
It could be about the chaos that ensues when everyone thinks Harry is a squib. Severus, being who he is, might initially be skeptical or even relish in the idea. But as the story progresses, he could discover that there's more to it. Maybe it's a plot by some dark forces to undermine Harry, and Severus has to reluctantly help Harry prove he's not a squib.
One possible plot could be that the Squib apprentice, despite not having magic, has a deep understanding of the magical world's history and lore. Severus discovers this and takes the Squib under his wing. Together, they might uncover some long - forgotten secrets about Hogwarts or certain potions. As they dig deeper, they face opposition from some traditional wizards who don't believe a Squib should be involved in such important matters.
In this fanfic, Harry's life as a squib would be full of hardships. He is constantly looked down upon. Severus, as a potion apprentice, is trying to make a name for himself in a dark world. One day, Harry stumbles upon Severus's potion - making lair by accident. Severus is about to punish him, but then realizes Harry has an uncanny ability to sense the properties of ingredients without magic. This leads to them collaborating. They start by making potions to help the oppressed non - magical people in secret. As their relationship grows, they come up with a grand plan to overthrow Voldemort's rule, with potions playing a crucial role in their strategy.
There could be. Fanfic writers often come up with all sorts of unique ideas. In the wbwl setting, the normal rules are sort of thrown out the window. Harry as a squib would change his entire character arc, and Severus as a potion apprentice might have a different role in a world where Voldemort has won. It would be interesting to see how the writer would develop their relationship in such a fic.
One great 'wbwl harry squib severus potion fanfic' could be 'The Squib Potter'. In this fic, Harry being a squib changes the whole dynamic at Hogwarts. Severus Snape's role also becomes very interesting as he has to deal with a non - magical Harry in his potion classes. Another one might be 'Squib Harry and the Potion Master'. It explores how Severus helps Harry discover his own unique abilities even without magic in the context of potion - making.
A great fanfic in this category is 'Squib Harry's Revelation'. It delves deep into Harry's emotions when he believes he's a squib. He has to reevaluate his relationships, especially with his friends who are all magic - users. He also has to come to terms with the fact that his life won't be like he expected. The author does a great job of showing his internal conflict. Another one is 'The Squib Among Wizards', where Harry's situation causes a stir in the wizarding community. Some see him as a threat, while others see him as an opportunity to change the way they view squibs.
Well, in these fanfics, a key plot point is often Harry's journey of self - discovery. As a squib, he's not the 'Chosen One' in the traditional sense. This can lead to him exploring other aspects of his identity. Also, the way the wizarding world reacts to him is fascinating. Some might pity him, while others might see him as a threat or an oddity. And his relationship with the Dursleys could be very different too. Maybe they're even more cruel since he doesn't have magic to defend himself. Plus, there could be a plot point about him finding unique ways to contribute to the wizarding world despite not having magic, like through his knowledge of Muggle technology or his different perspective on things.
I'm not sure of a specific 'wbwl harry through to be a squib' fanfic off the top of my head. But you can try searching on popular fanfic platforms like Archive of Our Own. They usually have a wide range of fanfics with different themes and plotlines, and you might be able to find what you're looking for there.