One possible theme could be unrequited love. If Simahin is in love with someone who doesn't return the feelings, it would be a very sad situation and unrequited love would be a fitting theme.
It could be the theme of betrayal. If Simahin trusted someone with her love and that person betrayed her trust, it would make for a very sad story. The feeling of being deceived by someone you love can be extremely painful and would be a central theme in such a story.
The theme might be loss. Maybe Simahin has lost someone she loved dearly, either through death or separation. This loss has left her in a state of sadness and despair, which is reflected in the sad story.
Well, I'm not sure who exactly Simahin is in this context. But here's a sad story. Simahin valobasa might be about a love that was never meant to be. Maybe Simahin loved someone who was already committed to another. Every time she saw that person with their partner, it was like a dagger to her heart, and she had to endure this pain alone, which is truly a sad situation.
The theme could be despair. If the man in the story is sad, it might be that he has lost all hope, perhaps due to some event related to Icecross.
Isolation could be a theme. The story could be about someone who feels left out on Valentine's Day because they are single or have been rejected in love. They watch the world around them celebrate love while they are on the sidelines, feeling sad and alone.
The main theme could be loss. Maybe the two animal characters in the story lose their love due to circumstances beyond their control, like the loss of their virtual habitat which forces them to part ways.
Possibly the theme could be about the hardships faced by the child. If Mother Jones is a figure of support or an observer, it might be about how the outside world, represented by Mother Jones, reacts to the child's sadness.
It could be about Luna's feelings of isolation. In the MLP world, Luna was once banished, and a fanfic could explore her lingering sadness from that experience. Maybe she still struggles with being accepted fully by the ponies, and the story delves into her inner turmoil.
The sad story could be about an abandoned old dog. The dog that found it saw the poor old thing with matted fur, skinny and weak, left behind by its owners who moved away or just didn't want it anymore. It's a common and really sad situation for many dogs.
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.
A typical sad story in Mapelstory could be about a player who has spent countless hours building up their character. They've made great friends along the way, formed a guild, and had many adventures. But then, due to a hacking incident, they lose all their hard - earned items and currency. Their friends start to drift away as they feel the character is no longer as strong or reliable. And the player, feeling defeated, has to start all over again, with a heavy heart.
Sylveon might have a sad story about being rejected by other Pokémon. Sylveon is often seen as a cute and friendly Pokémon, but perhaps in a group of more aggressive Pokémon, it was bullied. They made fun of its ribbon - like appendages and its gentle nature. Sylveon, being kind - hearted, couldn't understand why they were so mean, and it became sad and withdrawn, spending most of its time hiding in a corner all alone.