snake_mouth
A character with a mouth that is drawn wide--often shaped like a stretched-out "W" or a } rotated 90 degrees to the right--but which is usually only ever partially or slightly opened. This creates the visual impression of a snakelike mouth.
Also qualifying for this are especially wide :>-style closed mouths on a character who is already known for this sort of thing.
Notable examples of this are Ichimaru Gin, ]], and occasionally [[Koko Hekmatyar (all of whom, unsurprisingly, have some connection to snakes)
Aliases: none