20 years ago Empty void was the strongest ninja he was the partner of blast and collected mysterious cubes with him but 15 years later he became a monster via god and the mysterious cubes ans fought blast but he got injuries that led him to a 15 year old coma resting on a tube in the ninja village After the Monster Association downfall Saitama travels in time and zero punches cosmic Garou his cosmic energy escapes his body and suddenly a skinny and emaciated ninja , ninja had absorbed Garou's divine power and when he undergoes a transformation, he becomes muscular and robust following the absorption and growing long hair and seemingly adopting a mask and that Blast briefly confronted him after the power absorption and he was able to grab the surrounding space itself and use it to hide from Blast. but the ninja decided to withdraw from the confrontation with the hero and he returns to earth. I am Empty Void.