Top right might be yagyuu_juubei_(hyakka_ryouran). Between Miku and Youmu is most probably Kagamine Rin. Hm, Koishi and not Yuyuko? I'm inclined to think that it's Yuyuko because of the blue clothes and hat.
I'm also puzzled by that white bar on Flandre's ascot and how the flower pattern is cut-off around the top left.