Ok K.O. Let's be heroes: K.O's spawn from hell

During an attack from Boxmore, K.O was killed in an explosion during the battle. Now, 5 years have passed, and K.O was resurrected as a being with great powers of a demon and has returned to the land of the living, and is fighting villains and demons that are sent to Earth for the destruction of life and conquest by Demon Lord Malebolgia, while taking the form of a human teenager almost similar to him when he was alive. (Warning: this story contains dark elements, blood, death, mild sexual content as nightclubs, teasing, peeping, but no explicit content, read discretion is advice)