I’ve been looking for somewhere to post this, so if you’ve made it this far, my apologies. I wanted to share an idea I’ve had in mind in case a hack ROM creator, writer, or editor is interested in turning it into an actual project.
The idea would be an isekai story set in the world of Fire Emblem: The Sacred Stones.
The protagonist would be someone from our world named Yasha. I know it might sound like an unusual name, but I wanted to avoid the more common or cliché names.
Yasha was an ordinary person from our world who one day wakes up in the middle of a meadow without knowing how he got there. He’s wearing a tunic and carrying a small sword, although I’m still unsure whether he should actually keep the sword or instead be primarily a mage, or perhaps a mixed class.
As he walks around, he starts moving his hands and trying to concentrate, almost as if his body knows that he can do something that he himself doesn’t understand yet. Then something happens that he never could have imagined: he ends up summoning two creatures that he immediately recognizes as monsters from The Sacred Stones: a Gargoyle and a Gorgon.
Yasha decides to give them names:
- Diablos, for the Gargoyle, because of its demonic appearance.
- Melodious, for the Gorgon, because her appearance somewhat reminds him of a mermaid or a Medusa-like creature.
And that’s where the adventure begins.
Yasha knows that he’s in the world of The Sacred Stones, but he doesn’t understand why he can summon monsters, why he possesses dark magic, or why he was transported to this world in the first place. His initial goal would be to discover what is happening and find an explanation for his existence in this strange world.
The problem is that his ability to control monsters makes practically everyone suspicious of him.
Because of this, he would end up being pursued by both sides: those who believe he’s connected to evil and those who simply see his powers as a threat. In other words, he’d have trouble with both the forces of Renais and the forces of Grado.
As for the human character who would have the strongest connection with Yasha, I currently have two possibilities in mind: Nami, the archer, or Natasha. One of them could become his first major ally and the person who comes to understand him the most, especially after realizing that Yasha isn’t actually an enemy despite his strange powers.
I don’t consider myself particularly good at putting stories like this together or creating a hack ROM myself, so I thought that perhaps someone in this community—especially a writer, editor, or hack ROM creator—might be able to take this idea and turn it into an actual project.
I’d like to leave this idea here and see if anyone would be interested in making the project.
The only requirement I have is that I receive credit for the original idea.
Other than that, you are free to develop the story however you want based on this premise. I’d simply like the story to remain focused on Yasha, the characters who accompany him, the allies he meets along the way, and his first ally, as mentioned above, Nami or Natasha.
From there, you can decide whether to add other female characters, create original female characters for the group, or develop the characters and their relationships however you prefer.
You can also decide how Yasha himself works as a playable character. He could be a pure summoner, specializing in dark magic and monster summoning, or you could make him a mixed character who can also use swords, bows, or other weapons.
In short, the only requirement is that I receive credit for the idea. Everything else is up to whoever decides to make the project. You can change, expand, or develop the story however you want, as long as the basic premise and Yasha as the protagonist remain.
If you want to make Yasha some kind of weird or unexpected character—like making him completely crazy or giving him some bizarre characteristic—go ahead. 
Anyway, that’s all I ask.
Thanks for reading my idea.