I've had the idea to make a hack for a while now, and I only just finished working out the story: But here it is
FIRE EMBLEM: REVIVAL
Synopsis:
Many years ago, a mighty king named Gimest was killed in cold blood by Faesir I, his younger brother. As he took his last breath, he swore to avenge his death, cursing the bloodline of Faesir I. Many years later, Faesir I's great-grandson, Faesir the II, was born. Right from birth Faesir II was unlucky, he spent the whole first half of his life on the battlefield, on the front lines of the Great War. His coronation took place 3 days after the end of the war, and for a short time, there was peace. But, one fateful day, a mysterious man burst into the court of Faesir, and challenged him to a duel, claiming to be the legendary King Gimest. Faesir was killed in their duel, and Gimest re-claimed his throne. Faesir's eldest son, Aulus, went missing shortly before the arrival of Gimest. Remus, the next in line for the throne, was an unfit leader whose timidness was unmatched. He and his younger brother Lucas, fled the castle, preparing too re-take command of his kingdom. What Remus and Lucas do not know, is that the upcoming war would not only destroy their kingdom, but the entire continent of Cerviant.
Main Characters
Mechanics wise, it wil be like a fairly normal fire emblem game, save for one thing in particular: There will be a split path at the end of the game where you can choose whether to make Remus king, or to make Lucas king. Choosing either one changes the outcome of the game in a fairly drastic manner.