The girl in the back is Ariane, Stilldown's character, from theater of the bloody tongue. She has appeared before in the comic, all the way back in Chapter 13.
Here is Stilldown's comic!
https://theaterofthebloodytongue.thecomicseries.com/
Here is Stilldown's comic!
https://theaterofthebloodytongue.thecomicseries.com/
Awww shucks, looks like you've reached the last page. Maybe you should check out one of these?