I don't know the exact main characters in this particular story without more details. It could be the people who live in the haunted place with the open door.
Perhaps the main character is the person who first encounters the ghost associated with the open door. It might be a young girl or boy who is more sensitive to the supernatural and notices the strange happenings around the open door first. There could also be an old caretaker or neighbor who has some knowledge about the history of the place and the open door, and they play a significant role in the story by either warning the others or trying to solve the mystery of the ghost.
I'm not sure as I haven't read the specific 'the open door short story', but it could be a young adventurer who is drawn to the open door, seeing it as a chance for something exciting.
The main characters are Framton Nuttel, who is the visitor, and Vera, the young girl who tells the spooky story. Also, there is Vera's aunt, though she is more of a secondary character.
I'm not sure specifically as there could be many open door ghost stories. Generally, it might involve a ghost associated with an open door, perhaps something spooky happening when a door is left open at night, like seeing a strange figure or hearing unexplained noises.
There's no way to know for sure who the main characters are in this fanfic just from the title 'let my love open the door fanfic'. It could feature well - known characters from a popular series, or it could be an original take on a less - known story. The main characters could be people with special abilities, or just ordinary individuals whose love has extraordinary power. It all depends on the creativity of the author of this fanfic.
There could be a curious child as a main character. The child might be the one who first discovers the strange happenings around the door.
Maybe a young woman who lives in a house and the male ghost next door. The woman could be curious about the strange happenings in the neighboring house which are caused by the ghost, and that could be the start of their relationship.
The door in the cellar was an enigma. One evening, the homeowner, a brave woman, opened the door. Immediately, a stench filled the air. She saw a strange symbol on the floor and as she stared at it, she felt dizzy. Then she saw something moving in the corner. She panicked and closed the door, vowing never to open it again.
Once upon a time, there was a young girl who heard strange noises coming from behind a locked door in an old, abandoned house. One night, she was dared by her friends to open the door. As she slowly turned the knob, a cold wind blew out. Out of the darkness, a pair of glowing eyes stared at her. She quickly slammed the door shut, her heart pounding.
There could be a curious child as one of the main characters. This child is always exploring and it's their inquisitiveness that leads them to the secret door.
Since I don't know the exact 'door man story', it could be the doorman himself as the main character. There might also be some regular visitors like a kind old lady or a busy businessman who interact with him a lot.