I'm not quite sure how to tackle the Champions. They're a good source of money, but I feel I'm throwing away my tickets due to not dealing as much damage as I was when they first came out, so I'm trying to get more information about them. I know about the double damage from favorite position thing, but that seems almost impossible to trigger, and I'm not quite sure whether it's me swapping between girls when I click on them or if it's the game doing it and clicking on them does nothing. As far as the girls themselves, should I be focusing on girls whose class matches mine or should I be focusing on powerful girls regardless of their class?