Roller Girls Posters Design

I dont know who the North Star Roller Girls are, but these ads make me want to find out. I really like the way they are put together, from typography & photography, to colour use & illustyrations.
Very good art direction, they look like very exciting pieces of work! and most of all, the elements go well with each other, they look like one great design! If I were to choose my favorite out of these 4 it would have to be the "Blood Type" poster, because of its presence. the colours and illustration give it so much life, its hard to ignore!