Not trying to start any epiliptic trees, but
We see a few dressed like this on the back of gwiffons and megalogwiffons flying around but this is the closest we've ever seen one and even she/he is fairly indistinct.
Personally I suspect the ones in green armor are all converted Jiterati troops, or maybe Jiterati troops produced in the cities she captured from them. I think the ones in the dinner suits are Jillian's own FAQ troops. They're style of dress is similar to her one (discounting colour). It could be that they're setup for some sort of dance fighting (ballroom dancing?).
As for the crying megalogwiffon. I suspect the rider is also dead. if you look at the one landed directly to Ansom's left where he had most of his pikers, it appears to have the most spears in it, and the rider seems to have some sort of dark spot in the middle of his back which might be one of those pikes having pierced the megalogwiffon and the rider.