Here are the concept designs for the Aztec and Mayan Nyos~ (note all cities are absent here)

Zyanya ("forever; always")

Chicahua ("strong")

Nochtli ("prickly pear fruit")

Eztli ("blood")
[NOTE: the name looks weird because this image is flipped, I accidentally drew the scar over the wrong eye and this was the only way I could correct it at the moment... -w-||| ]