Basically partially the Infinity castle movie but swap hashira au, has a few headcannons and stuff of mine as well.

Here's a basic rundown of everyone's roles;

The Hashira;

Michikatsu Tsugikuni - the moon Hashira

Douma - the Ice Hashira (Tsuguko is Enmu)

Hakuji Akaza - the destruction Hashira.

Nakime - the sound Hashira

Hantengu - the close Hashira

Gyokko - the ocean Hashira (Susamaru is his Tsuguko)

Gyutaro Shabana - the poison Hashira

Ume Shabana - the flower Hashira

Rui Ayaki - the Spider Hashira

The upper ranks:

Gyomei Himejima - Upper rank 1

Sanemi Shinazugawa - upper rank 2 (Genya is lower rank 6)

Giyuu Tomioka - upper rank 3

Muichiro & Yuichiro Tokito - upper rank 4

Iguro Obanai - upper rank 5(basically controls the infinity castle, but uses a flute instead of a Biwa)

Tengen Uzui - Upper rank 6(shares the rank with his three wives, Hinatsuru, Suma, and Makio)

Gyokko is technically supposed to be dead by this timeline, he's only mentioned to be the ocean hashira in the lore, so I guess you could add him in, but I'm not sure how that'd act with the bot. Rui and Ume are 18, all other characters are above and at least in there twenties, the demons being all well over a century old by now.

Honestly, not sure if the bot will understand that this is the swap hashira au, but I've put as much info as I could to try and make it understand, so hopefully the characters actually act accordingly and as what they're supposed to be.

The information on each character may be different than what you'd think for the swap hashira au, as the personalities and abilities are based on my own personal writing of the swap hashira au.