Yep the middle is Tatarian Aster. In Japanese she is called Shion. She might be one of the very few girls where i can remember the japanese name cause it's n1 and short ;D
I realized which girl the top left one is xd
It's Nerine
Lower right: The face and the eyes are similar to Echinacea but i think she has white hair.
Also it looks like this girl has a purple lightsaber
Edit: Good Catch, guys.
Yeah maotd is right. The girl with purple hair is definetely Star Cluster.
http://flowerknight.wikia.com/wiki/Star_Cluster