Kool-Aid Man has been a proven advertising star for longer than I thought possible. Here is a refreshing history of the living pitcher of fluid, the anthropromorphic jug of tasty juice who has been around since 1954.
Star of TV and print, Kool-Aid Man had his own comics of course, first from Marvel for three issues and then over at Archie Comics for many more. The artist most closely associated with the comics is proven Archie veteran Dan DeCarlo. Some see the hand of John Romita (or his "Raiders") on a few of the Marvel covers. The Adventures of Kool-Aid Man are weird artifacts from a weird time when entertainment and advertising were the same thing, it's a time in which we still live alas.