"Tsumamushi"
One of the interesting things that pops up for one speech bubble and never again, but is very significant. The term "tsumamushi". This word, it comes for a population of ghouls who've been mostly isolated from Japanese society since probably somewhere around the Meiji Era, which is also probably around when the Washuu clan consolidated their power and began the CCG. I don't actually know where it's stated that "kagune" isn't Japanese ghouls' own word for it, but the word the CCG gave it. But. It makes sense that this is the case, since "kagune" is apparently just "red child", (that's what RC stands for), the name given by humans to the special cells, written using unusual kanji/readings.
So. "Tsumamushi" may very well be Japanese ghouls' original word for it, before it was replaced by the word humans came up with, that the CCG uses.
That's a pretty important bit of worldbuilding to stuff into one speech bubble in one panel. And yet it really couldn't have come from anyone but these three, who haven't had those kinds of things erased.
