The deuteragonist of Chainsaw Man, Aki quickly became a big hit with the fans due to his development from a revenge-seeking emotionless machine to a person who showed growth and eventually feelings of friendship and loyalty towards Denji and Power. So following his trauma-inducing and tragic death at the hands of his friend, Denji, it was understandable that fans were left heartbroken and wondering whether there was any possible way in which he could return to the series.
Unfortunately, to add to the disappointment of fans, as of this moment there has been no way or alternative revealed in the CSM universe through which Aki could return. Aki was not a hybrid like Denji but a Fiend which meant that his body was in essence at the mercy of the Devil which possessed it, which in this case was the Gun Devil.
Who Killed Aki in Chainsaw Man?