Nyx

He was the mastermind behind everything, the powerbroker, the one with the plan.

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Kaz's Southern Kerch accent coming out thick whenever he's drunk, or on very specific words that he avoids saying for that very reason

Ravkans being able to tell when foreigners learned from a textbook or a standard classroom because they talk vaguely like middle-aged nobles

East Ravkans and West Ravkans having different accents, expressions, and slang because of being separated by the Fold for so long

Specific dialects on the disputed borders (the Ravkan-Fjerdan border, the Ravkan-Shu border, etc.)

Nikolai having to change how he speaks as Sturmhond so that his very posh noble accent doesn't give him away

⬆️ Wylan trying to do the same thing in the Barrel so he's not noticed

Jesper chatting with anyone and everyone who speaks a lick of Zemeni

Some Suli people speaking Suli, others speaking a dialect of Ravkan, others just using "standard" Ravkan/Ravkan with a particular accent

Matthias using hardcore military expressions and slang without even knowing it