The writer of the show, that's who! He worked on the game, too. Man, a series and a manga and two spinoffs of torturing these girls apparently wasn't enough for Gen Urobuchi. He had to join in on a video game which is in itself, like, five spinoffs.

Damn. o___o

They are! They're genuinely artistic in so many different ways, even if there's like this acid-trippy undertone - like, Elsa Maria and Charlotte look so different. I think it's the variety to all of them that helps them be so striking. It stops them becoming "generic magical girl mooks".