I'm not sure if it's popular. It depends on various factors like how well it's written, the plot it offers, and how much it appeals to the Harry Potter fan community who are interested in Ravenclaw - related stories.
Often in fanfics, characters like Raven Ebony are used to explore different aspects of the Harry Potter universe that the original books didn't fully cover. She could be a love interest for one of the existing characters, or she could be involved in a secret society within Hogwarts. There are countless possibilities depending on the creativity of the fanfic writer.
Perhaps Harry is given the task of mentoring some young Ravenclaw students. As he spends time with them, he starts to appreciate the values of Ravenclaw more. He might learn from them as much as he teaches them, and this could lead to new friendships and a different perspective on the Hogwarts houses in general. Along the way, they could face challenges together, like dealing with a new dark magic threat that targets Ravenclaw specifically.
You can start by looking on fanfic websites like Archive of Our Own (AO3). It has a large collection of various fanfics, including those about Harry Raven. Another option is FanFiction.net, which also has a wide range of fan - created stories.
One great Harry Raven fanfic could be 'The Adventures of Harry Raven: The Lost Artifact'. It takes Harry on a journey to find a powerful magical item. Another one might be 'Harry Raven and the Forbidden Forest Encounter' where he has to face various challenges in the forest. And there's also 'Harry Raven's School Days' which focuses on his experiences at Hogwarts.
Well, without having read it, it's hard to say exactly. Maybe it's a fanfic where the author took the concept of Ravenclaw and did something really off - putting with it in the context of the Harry Potter world. It could be that they misinterpreted the traits of Ravenclaw students or made up some really strange storylines related to Ravenclaw that made other fans think it was terrible.
Raven could be a new character created specifically for this fanfiction. She might be a powerful witch from a distant magical land, with unique magical abilities like the power to communicate with magical creatures on a deeper level.
One interesting 'raven harry potter fanfic' could be one where Ravenclaw students play a crucial role in a mystery that Harry and his friends are trying to solve. Maybe they use their intelligence and knowledge of ancient magic to help uncover a hidden secret about Hogwarts.
Another theme is the exploration of intelligence. Ravenclaw is the house of the wise, so in these fanfics, there's often a focus on the character's intelligence, whether it's solving magical puzzles or outsmarting villains. For example, the Ravenclaw character might use their sharp mind to help Harry in his battles. And also, the discovery of self - identity is common. The Ravenclaw - related character may be on a journey to find out who they really are within the context of the Harry Potter universe, especially when they are involved with Harry in different adventures.
It could be because the plot is full of holes. In a good Harry Potter fanfic, the plot should be somewhat consistent with the original series. If this 'raven' fanfic has a really disjointed plot, that would make it terrible.