you can customize the mythic skin but when you load into practice range, it shows the original level 1 options and when you continue it just switches to the skin you are originally wearing. Havent tried all of them (im pretty sure its the same for all unless you already have the mythic and put it on), but on console you cant even go into practice range with genjis + Junos mythic heroic highlight intro goes mute at the end;/ With kirikos K-2000 Blademaster skin, highlight intro protector of kanezaka is also mute