In the fanfic, the letters might be a way for Rebastian Lestrange to reach out to Harry for help. Perhaps Rebastian is in a difficult situation, involved with some dark forces against his will, and he sees Harry as his only hope. The letters could be filled with his desperate pleas and the information he has about the approaching danger.
The letters might play a role of connection. They could be the only means through which Rebastian Lestrange and Harry communicate, bridging their two different worlds or situations. For example, if Rebastian is from a family with a dark past and Harry is the hero, the letters are the link that brings their stories together.
Well, 'Hidden Messages in the Letters' is also a wonderful piece. It focuses on how the letters serve as a medium for the characters to explore their relationship in a very unique way. The way the author describes the letters and their significance is quite remarkable.
A 'harry no letters fanfic' could be about a fan - created story where Harry (presumably from the Harry Potter series) is in a situation where letters are not present. Maybe it's a story set in a world where the magical letter - sending system has broken down and Harry has to find alternative ways to communicate or get information.
The Harry Potter rejection letters in fanfic could be a creative way to explore alternative storylines. For example, if Harry himself received rejection letters from potential allies or organizations in the wizarding world, it could lead to him having to find other ways to achieve his goals. It could also show how the wizarding world isn't always as accepting as it seems, and there are bureaucratic or personal reasons for rejections.
It could be a fellow student who has a secret crush on Harry but is too shy to reveal their identity. Maybe someone like Luna Lovegood, who is known for her unique and somewhat mysterious personality.
Another option is to check out Tumblr. There are a lot of Harry Potter fans on Tumblr who share and discuss fanfics. You can search for relevant tags like #harry no letters fanfic or related ones. However, Tumblr's search can be a bit finicky sometimes, so you might need to dig a bit deeper.
There's no way to tell who the author is just from the title 'black letters a harry potter fanfic'. It could be a relatively unknown writer on a small fanfic website or a more popular one on a major platform. We would need to search for it on fanfic repositories and see if there are any credits given there.