For the color scheme variants, I will be starting off with Monochromatic Color Scheme because my game either is rainbow because of the RGB gaming setup that the character will have or it's the colors of the enemy and so I chose the enemy because his monochromatic color scheme is simply red downscaling to black as seen in this picture here.

And when it comes to the Analogous Color Scheme, the enemy also has the pattern that follows: Red, Red-Orange-Orange. As shown in the picture below, this is the analogous color scheme that can be see in the enemy's face texture 

For Complementary Color Scheme, the enemy doesn't really fit that description because it doesn't use colors that would be opposite of each other in the color wheel, the closest we can get would be Red to Yellow but that still doesn't fit the description of complementary color scheme.

Here is the enemy again for reference to the color schemes