Excellent Getter Mario! And you seemed to have forgotten this one:
The character for CHF even admitted Freddy Claw was a female version of Dr. Hell + Count Brocken, and Gorgon Claw was a remale version of Duke Gorgon.
I believe SCUD Panther (the villian next to Freddy Claw) is based off the villianess from Great Mazinger. (I'm not sure since I haven't seen all of Great Mazinger)
Also, don't these three doctors look familiar? ;)