King Features Syndicate which newspaper comic strips, and for a time they published a number of comic books featuring the strips they syndicated. As the profits for their comic books started to drop in the 60's they left the business and since then license the characters to other publishers.

The List of Characters that were considered Super heroes

Agent X-9 (King Features) (created by Dashiell Hammett and Alex Raymond)

Brick Bradford (King Features, Nedor)

Flash Gordon (King Features, Toby Press, Eastern Color, Dell, Harvey, Charlton, Gold Key, Marvel, DC, Dynamite)

Jungle Jim (King Features, Nedor, Dell, Charlton, Dynamite)

Lothar (King Features, Harvey, Marvel, Dynamite)

Mandrake the Magician (King Features, Harvey, Marvel, Moonstone, Dynamite)

Prince Valiant (King Features, Dynamite)

The Phantom (King Features, Gold Key, Harvey, Charlton, Marvel, DC, Moonstone, Dynamite)

Ming the Merciless (King Features, Toby Press, Eastern Color, Dell, Gold Key, Harvey, Charlton, DC, Marvel, Dynamite)

Dynamite is publishing all of King Features Syndicate hero sans Agent X-9