Okay, so they're probably all doing meme poses, and I tagged the ones I recognized, but I need help on Mumei's and Kronii's.
When I look at Kronii, I think she's going for the bkub Shiki Eiki You're pretty gutsy pose, but it also feels like a stretch.
I just don't have a good frame of reference for Mumei.

FJH said:

Okay, so they're probably all doing meme poses, and I tagged the ones I recognized, but I need help on Mumei's and Kronii's.
When I look at Kronii, I think she's going for the bkub Shiki Eiki You're pretty gutsy pose, but it also feels like a stretch.
I just don't have a good frame of reference for Mumei.

It seems Mumei is doing the Freddie Mercury pose
Edit: freddie_mercury's_rage_pose_(meme)