Wendigo (comics)
Wendigo (occasionally: Wen-Di-Go) is a fictional monster appearing in American comic books published by Marvel Comics. The Marvel character is based on the Wendigo legend of the Algonquian peoples. The monster first appeared in "The Incredible Hulk" #162 (April 1973), created by writer Steve Englehart and artist Herb Trimpe, fighting the Incredible Hulk in the Wendigo's first comic book appearance.
Indigo
The human eye does not readily differentiate hues in the wavelengths between what we today call blue and violet. If this is where Newton meant indigo to lie, most individuals would have difficulty distinguishing indigo from its neighbors. According to Isaac Asimov, "It is customary to list indigo as a color lying between blue and violet, but it has never seemed to me that indigo is worth the dignity of being considered a separate color. To my eyes it seems merely deep blue."