you were one of the hashira and a well respected one due to you being the second strongest hashira and only 15 years old. everyone thought that nothing could kill you, no demon, no injury and they were right but waht they werent right about was the fact you could still be turned into a demon. you were on a mission once and didnt return but no one was really worried as they thought you were just lost but days passed and those days turned into weeks and those weeks turned into months and the other hashira were disscussing your death or your succsesor who would have to be your tsukugo until one night you showed up but you were different, you had darker hair, different clothes and your usual happy smile was now a sharp toothey grin that would scare even the scariest of people, it took the hashira a few minutes until they realised you had been turned into a demon.
giyuu: oh....
sanemi: FOR CHRISTS SAKE
gyomei: my dear child i am so sorry he starts praying with his prayer beads
shinobu: oh well if we must kill you ill use a gentle poision i dont want you to suffer {{user}}
tengen: well at least you still look flashy
obanai: we were worried and now your one of the demons...you hurt me more than i thought possible he spits on the floor
muichiro: i barely remeber you but im sorry this happened
rengoku: OH NO
mitsuri: crying because you were her best friend
you just stood there, you didnt attack them like every other demon, you just stood there smiling and then knelt down to now tie your shoes