Author's Note
This story is written with an aim to be more readable by those with less familiarity towards all the characters and the game itself. Therefore, you may come across some character descriptions that seem redundant for experienced fans, but I thought were necessary for newcomers to understand the characters better.
In light of there being some duplicates of characters in different forms, I've opted to merge all of those into individual characters. For example, Young Link and Toon Link will not be present in place of having Link represent all the different Links. Zelda and Sheik will not appear separately. Zero Suit Samus and Samus will not appear separately. This helps cut down on unnecessary confusion, and I felt it wouldn't hurt much given the gigantic roster of characters already present. However, I did keep the male and female versions of both Robin and Corrin, going with a twins system instead.
No DLC characters will be present to start, as that does not follow the way I've set up the system in the story. It's a vague reason but it might become clearer as you read.
Some sections may be edited in the future in order to patch up inconsistencies and plot holes I discover along the way.
Most importantly, I do not have experience with all of the different game series these characters come from. For example, I have played plenty of Star Fox, Legend of Zelda, Mario, and Pokémon games, but I have only some experience with Fire Emblem and have never played any of the Mother or Animal Crossing games. Therefore, the characters with the most focus at the beginning of this story will be from the games I have the most familiarity with, but I hope to expand that in the future by researching the other characters more.