Begin with a mystery. Drop the reader right into the middle of a strange situation without any explanation at first. Maybe start with a character finding a strange symbol carved into their bedroom wall that they've never seen before and having no idea how it got there. It creates instant intrigue and a sense of foreboding.
I'm not sure specifically what 'game kitchen story' is. It could be a game related to kitchen adventures, like cooking in a virtual kitchen within the game.
Well, in the mafia game story, it goes like this. There are different roles. The mafia wants to win by killing off all the good guys which are the civilians. The civilians don't know who the mafia are at the start. So during the day, they talk and try to find clues. Then they vote to lynch someone they think might be mafia. At night, the mafia wakes up and decides who to murder from the civilians. It's a game of deception and deduction.
One interesting 'Harry Potter' fanfiction with shadow elementals could be about a new dark magic that is related to shadow elementals emerging in Hogwarts. The main characters might have to figure out how to combat this new threat. Maybe a shadow elemental is used to guard a secret chamber that holds a powerful dark artifact.
Harry himself is often a popular character in such fanfics. His journey can be retold with a sassy edge, like making his internal monologues full of sassy remarks about the situations he finds himself in. For instance, when dealing with Snape's difficult classes.
Not having read 'Dark Mirror A Novel', it's impossible to accurately name the main characters. However, based on the title, we can assume there may be a character whose life is deeply affected by the dark mirror. There could also be characters around this person, like friends or family members, who either get involved in the events related to the mirror or try to help the affected character break free from whatever hold the mirror has on them.
Once, my family decided to have a unique Thanksgiving. Instead of a traditional turkey, we tried to cook a giant ostrich egg that someone brought as a joke. We had no idea how to cook it properly. So, we just put it in the oven like a regular egg. Well, it exploded! There was egg everywhere in the oven, and the smell was really strange. But we all ended up laughing so hard at our silly attempt.
There was a spooky graveyard where a gost was rumored to haunt. The gost was that of a headless knight. Legend had it that he was decapitated in a battle long ago and now he roamed the graveyard seeking his lost head. At midnight, when the moon was full, if you dared to enter the graveyard, you could see a faint glow moving around. It was the knight's ghostly form. One night, a young man went there to prove his courage. He saw the glowing figure approaching him. He was so scared that his legs froze. Just as the figure was about to reach him, he fainted. When he woke up, he was outside the graveyard, not knowing how he got there.
One key point is his upbringing which influenced his music. Another is his entry into the music industry.
It differs mainly in its emotional tone. While other fanfics might focus on adventure or romance, this one is centered around mourning. So it has a more somber and reflective mood.
You can start by looking on popular fanfic platforms like Archive of Our Own (AO3). Use the search tags related to RM and Jin, and then sort the results by popularity or rating. That way, you can quickly find the ones that are highly regarded by other fans.