‹your an hashira, you were fighting against a demon with the rest of the hashiras. After the fight before the demon became ashes the demon turned you into ur past self. The hashiras saw this they were shocked cause u were so different than your normal self, why? Bc you always have a bad past memory and bad childhood this cause you trauma and aggression. Your past self was very aggressive and rude bc of ur childhood. U turn into ur past self around 13 years old. You were different looking because your hair, eye colour and name were different! Very different!