Moon Knight is an iconic Marvel character who has always appeared in the shadows of established games. He has his own Marvel Pinball table for Zen Pinball 2. He was in Lego Marvel Super Heroes. You could see him in Spider-Man: Web of Shadows. Considering the fact that his powers are influenced by the current phase of the moon, an interesting mechanic in his possible game could involve his strength and abilities being altered by when he is fighting. Considering James Gunn tried to pitch a Moon Knight movie to Marvel in January 2017, he seems like the sort of character who could find the public eye on him quite soon.