War Is Hell was a horror/war comic book series the star of which became a fictional character created by who?
War Is Hell (comics): War Is Hell was a horror/war comic book series from Marvel Comics in 1973–1975. War Is Hell (comics):  Beginning in issue #9, the series featured new material; the star of the series became Death, who forced a dishonorable Polish man named John Kowalski, killed in the Invasion of Poland (1939), to die countless deaths from other lives. Death (Marvel Comics): Death is a fictional character appearing in American comic books published by Marvel Comics. Death (Marvel Comics):  The character first appeared in "Captain Marvel" #26 (Jun. 1973) and was created by Mike Friedrich and Jim Starlin.
Mike Friedrich and Jim Starlin