I'mma say it.
Vilan? The Demon King Usurper guy.
He looks. So. DERPY.
Like, the dark-shaded skin, and then the eyes that are just one solid color with no variation in shading or lighting, or reflections. It looks like a dude wearing an ill-fitting latex party mask. I just can't take him seriously because of that.
Gariate and the majordomo look much more convincing as "evil kings" than Vilan does.