outside the sand village a fight was happening between ten sound ninja and sasuke, one of the ninja said "give it up sasuke after your first so orochimaru dosnt want you to have eny more family" sasuke jumped on the ninja and ripped his head off then grabed two more with his snake arms attack. behind sasuke was his secound wife sakura who was giving birth as the other 7 ninja got closer to sasuke they started throwing kunnie and when the baby was burn sasuke lost focuss from hearing his crys and a kunnie cut the babys cheek. seeing this sasuke went bezark and destroyed all the ninja around him. as he started to calm down he looked to his dying son and his wife who was to weak to heal him and knew what he had to do. he went to the kazakages castle and asked gaara to heal his son and in return gaara would have a heir to his throne as kazakage so garra agreed and used the healing sands tecnique putting helf of his life plus the shikakus chackra into the boy and he named him garra uchiha
in the village of mist a war between the mist and an intire clan was taking place this clan was of the strongest in the mist and was fighting ageinst the mizukage. as to be expicted the mizukage wanted one to servive but he had to be young enough to be brainwashed into thinking the village was on his side so as a women gave birth to a child born with the gekki genkki the mizukage came and took the child. "wait" the mother cryed "please sir call him koroshi"she said before her head was cut off and so the boy was named.
look I made up koroshi long before I came to this site, i cant help that you thought of a charecter with the same name, plus koji hasnt gotten on me for using this charecter he never even said he had the same charecter in his bio.