The girl on the left, the girl between Saji and Louise and the girl in front of Graham are all linear train attendants (HRL, Union and AEU from left to right). The nekomimi girl is Hanayo (not Gundam Meister 874) and the blonde girl with white dress is Sherilyn Hyde, both from from the sidestory manga 00F.
I removed the Tieria Erde tag since I honestly can't see him in this picture.