Good video but you missed some details: B5 is B4 from monochrome M2 is also from monochrome Same whit M3, this time being one of the voices in the original M5 is a direct reference to fallout M6 is the undead priest from monochrome and neither monochrome nor gestalt have a bonus anymore
E4 might also be from Monochrome, his eyes look like that one bald polo with the different face, same thing with B2, might be the guy with the long face. Personally I think M3 is the guy who had his brain exposed in Monochrome