The Shadow King is pretty much the Exorcist. It’s not something you want to casually cross paths with in the MCU. This malevolent entity is evil in every way possible. It travels from host to host and uses telepathy to gain its power through evil. This one belongs in a supernatural part of the world, where ghosts rule the night. This one believes that happiness doesn’t exist and that the true part of existence is to feel misery and be miserable. As Shadow King himself puts it, “Happiness is a lie. Life is horror. The light is always dying, all across the universe. The last star will flicker out someday. When it does, all that remains… shadow. And I will be its king.” (Comic Vine).