It's my favorite

Dylan White

The main Genie uses prosthetic material to make his face look like that of the character, it was sculpted on him before every show, a process that could take up to two hours. As for the duplicate genies, they're all using face masks that can easily be put on in seconds as the performers that are playing the duplicate genies are also playing other ensemble roles in the show. They need to be able to quickly change in and out of the costumes. As for why the costume design is the way it is, it's likely because the show was first performed back in 2003 before the advent of HD cameras and KZfaq. They probably didn't anticipate cameras being able to zoom so close and in such detail. From an audience member's vantage point, the masks looked somewhat normal.

Because traditional genie characters on stage are played by black men. and if any other race plays genie, then they need to do blue face, since black face is out the question lol