The 'a sad sim story' might revolve around a Sim's unrequited love. The Sim falls deeply in love with another Sim who doesn't feel the same way. This leads to a lot of heartache and sadness for the first Sim. They might try everything to win the other's heart but end up getting rejected repeatedly, which makes them withdraw into themselves and become a sadder version of themselves.
A Sim who has always been an outcast in their community could be the main character. They are constantly bullied or ignored by others. This makes them feel unloved and sad. Their story could be about how they try to find acceptance and love in a world that seems so cold to them, but keep failing, which only adds to their sadness.
Perhaps Celly had a pet that she loved very much. One day, the pet ran away and never came back. Celly searched everywhere for it, asked the neighbors, put up posters, but still no sign of the pet. She missed the pet's company, the way it would greet her when she came home, and this made her really sad.
Maybe it's about a haunted house where some tragic events occurred in the past, like a family being torn apart by illness or misfortune, and the lingering sorrow still fills the house.
The plot could be that Silver gets trapped in a time loop where he keeps seeing Blaze die over and over again. Each time he tries to save her, but fails. His love for her is strong, but he's powerless against this cruel fate, and his despair grows with each loop.
The puppy could be lost. It wanders around the streets, not knowing where to go. Every time it sees a person, it hopes that it's its owner coming to find it. But no one stops to help. It gets hungrier and thirstier as days pass.
A sad plot could be that an MLP loses its home. Maybe due to a natural disaster like a huge flood or a wildfire. The pony has to flee, leaving behind all its memories and possessions. It then has to struggle to find a new place to live, facing rejection from other pony communities because they are afraid of overcrowding or don't trust the new pony. The pony feels lost, alone and sad, constantly reminiscing about its old home and the happy times it had there.
Perhaps the mime is in love with someone who doesn't notice him. He follows her around in his mime world, always a few steps behind. His movements are gentle and longing, like when he mimes opening a door for her but she just walks through without seeing him. His face shows a constant state of heartbreak as he tries to get her attention but fails every time.
Well, it could be about a player who worked really hard on building their dream virtual house in Roblox but then lost it all due to a glitch. They might have spent days gathering resources and designing every little detail. It's really sad when all that effort goes to waste just like that.
Imagine a snake that lived in a peaceful meadow. Then, a large construction project started there. Bulldozers and machines destroyed the snake's home. The snake was injured during the process. It tried to find a new place to live but was constantly chased away by other animals. With no place to go and no one to help, the snake's life became a series of sad and desperate struggles for survival.
The cyborg might be in love with a human, but the human is repulsed by its non - human parts. So it has to watch the person it loves from afar, heartbroken.