Fun fact: later in the same chapter, we see a similar illustration where Ikumi sacrifices herself to defeat a mirrors offshoot using the Kimochi of sadness, and that illustration portrays them in the same positions as this one. Furthermore, in a later chapter, we see Infinite Iroha face down Winchester in another illustration that portrays them in similar positioning.
Patchy would be the Tzeechian IMO with all of the books and the like, Though you could also argue Shinki as weird crystals are Tzeentch's thing and Makai is full of them.
I really like this picture because when I heard Kanon for the first time, her VA sometimes really made me think of Rina Satô. I don't know if the artist felt the same as me, but still, that's a nice coincidence.