As for the intended audience (can't speak for the comic cause I never read it, but I can for the show). You say it was for girls. However there's enough fighting and action and adventure in the show, and not too much romance and other "chick flick" stuff (though there is some), that it appears to be suitable for both boys and girls. To me what this show represents is an attempt to produce a show that is like any other generic action flick, but without the normal sexist way of doing it, and in fact reversing the sexism so to speak. If you watch most action/adventure cartoons or anime, most of them will have most or all of the main/hero characters being male. But in this, of the six heroes, 5 of them are female. I'd say this show is a political statement from women that more often women/girls need to be shown in positions of power and as heroes, rather than just victims (in fact, in season-1 episode-2, the male hero was rescued from a dungeon by one of the female heroes, a complete reversal of roles, it would be as if Zelda had to save Link in a Legend of Zelda game). But regardless of any political statement intended, I'd say the level of action etc, is enough to keep guys (such as myself) watching, while also having certain elements that are appealing to girls.