Maybe you could show pictures of really old Visual kei photo shoots (like super old gazette or miyabi or malice mizer) and have people guess the band mates compared to now. Or you could post all the hilarious videos of Gackt, those are always fun.
You could also have a segment showing really good visual kei cosplays or really good lolita fashions, maybe go through some japanese clothing brand photobooks. (I know h.Naoto has all his photobooks posted online)