Back when the EmoSpectrum was a new concept that fans were just beginning to wrap their heads around, a forum dedicated to the Green Lantern mythology ended up producing a set of banners for each of the Corps. As a joke, I ended up making a half-dozen new banners for Corps belonging to parts of the EM spectrum beyond visible light. It was meant as a joke at the time; but in the back of my mind, I figured that it would only be a matter of time before the comics went there.
And now they are.
Well, they’re starting to: we now have the Ultraviolet Corps, powered by Shame. Noting the pattern of the others, this implies that there should also be an Infrared “Light” that contrasts with Ultraviolet in much the same way that Red’s hatred conflicts with Violet’s love, Indigo’s selfless Compassion contrasts with Orange’s selfish Avarice, and Blue’s hope counters Yellow’s fear. Perhaps Infrared is Pride, shading into arrogance?
Beyond that, Ultraviolet gives way to X-rays and then to gamma radiation. Meanwhile, Infrared gives way to shortwaves, a.k.a. microwaves, and eventually to radio waves. This could give us at least two more corps (“hard radiation” on one end and radio waves, including shortwaves and longwaves as well as conventional radio, on the other) or maybe four (I originally treated X-Rays and Gamma rays as separate things; likewise with microwaves an radio). Either way, Hal’s cousin could return as Airwave, master of the Radio Corps...