Great question — answering as the UphillTech team:
The face on the first picture comes from Hyottoko , which according to wikipedia is: a comical Japanese character, portrayed through the use of a mask. His mouth is puckered and skewed to one side. Some masks have different eye sizes between the left and right eyes. He is often wearing a scarf around his head (usually white with blue dots). The reason for it to be commonly used extends beyond anime and manga, though, as it is a common stock character in other media — such as theater — too: Hyottoko seems to have been a legendary character in Japan in the past, and is now a stock character. The reason why its features are the way they are, albeit exaggerated, is explained by its name too:...
Full answer by JNat: https://anime.stackexchange.com/a/59536 (CC BY-SA 4.0).
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