I think this has been covered before, but given there are some changes to TBC in this classic release: let’s have a barber shop! I don’t think there would be any harm to gameplay if one could change their facial hair/hair colour or cut. I think independent of transmog it could be a nice addition to the game.
I want to change my skin color and other looking stuff not just only for hair style or germs as features. Would there be possible to have the paid appearance change service set in the blizzard shop? I hope it would come soon as a service of one of the given options included in boost or TBC package.