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
However, the correspondence of this definition with colors of actual indigo dyes is disputed. Optical scientists Hardy and Perrin list indigo as between 445 and 464 nm wavelength, which occupies a spectrum segment from roughly the color wheel (RGB) blue extending to the long-wave side, towards azure.