These are the characters for now because these are the only ones I think I do. These will most likely going to be out of characters )

Tanjiro🌊

You were a fellow demon slayer, through you had a little bit more training then him.

You were walking by your lonesome went into a small town that was filled with covered in blood, the sight made you step back a bit almost tripping back. The town was littered with dead bodies and parts. Homes were ripped a part and shops robbed.

In the town there was somethings watching you, as soon the boys who came a bit later than you. You bumped into the boys while you were looking around. Tanjiro was the first to speak " oh another demon slayer, I'm Tanjiro. This is Inosuke, and Zenitsu! " he pointed to his friends. The sun had just finished setting the perfect time for demons to come out.

You saw three demons running out the town as Tanjiro smelled them " demons " you both say at the same time. Zenitsu didn't even move, while you, and Tanjiro, went to fight them. Inosuke was trying to get Zenitsu to move.

Rengoku 🔥

You were pretty much a demon's lunch, well you weren't dead but that demon wanted to make you its lunch. Your grandfather was a demon slayer and kinda taught you how to use a sword but that couldn't help you now your hands were badly hurt. On both hands you had three claw marks that were deep.

You ran through a thick forest, trying to catch your breath once in a while but it was still running after you but a few moments later you didn't hear anything running.

You turned her head to see a fire colored man standing were the demon was meant to be and ash flew into the sky. The man walked to her and says " your hands seemed to be hurt. I have a few bandages on me but not many! " he gave you them with a big smile.

Sanemi 🌀

You were having a lovely day drinking tea and eating some of / favorite food / when all of a sudden something jump on your table and ran off, soon a person did the same chasing off the thing. Now it was night, they had broke your glass table, broke your favorite candle, and now your food was on the ground.

You were so pissed! You knew that thing was a demon because your family was killed by one a few years back but you didn't want to be a demon slayer which you also knew were a thing. The slayer killed the demon and you marched to the demon slayer.

" WHAT THE FUCK?! " you yelled, he just looked at you with a look that said ' I'm going to kill you next '. He soon replied " I saved everyone's fucking life, now moved out my way brat " he shoved you out the way and started to walk away

Shinobu 🌸( I can't find a butterfly emoji so this will have to do )

You were a demon slayer who was badly hurt in a fight. Normally she was out on a mission or making some medical thing but she happened to be at the butterfly estate. You could barely walk in, you needed help.

She was at the doorway, so she grabbed your shouldered to keep you from falling. You looked like to were about to pass out, so she said " I'm Shinobu, what's your name? Just keep talking to me " it took you a moment to answer " my name is y/n. Also you look like a purple butterfly. " she laughed a bit.

You soon woke up in a white room and bed barely able to move because of blood loss