Towards a Theory of WidthI believe it's high time we formalized this crucial matter. At first I believed this to be a simple task, I thought we could say wide was a subset of chibi, but reality is never so straightforward.
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Ume Aoki - Orthodox WidthUme's default head shape is hexagonal, alternating with a rectangle or narrow oval that are about twice or thrice as wide as the default while retaining roughly the same height. Eyes change too, going from a fairly regular form to to her trademark (✖╹◡╹✖). It's a very clear contrast, absent in Madoka for the sake of srs but commonly extended to it in fanart. The golden standard.
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tkmiz - Heterodox WidthUnlike Ume, tkmiz's heads are predominantly circular, blobby, and don't have a qualitatively different mode of width, instead characters will melt or be stretched like fresh dough. Their eyes do not change either, as can be seen when Yuuri gets NARROW'd in ep 2. However, after an exhaustive review I've come to the conclusion they are not nearly as wide as the hidamaris. They mostly stick to their regular-sized blobheads, and it's only in Shimeji that their proportions
sometimes change in a way that's comparable to Ume's or even more radical. However, this model is widely recognized as wide, so excluding it would be negligence. ("Don't be so wide about it" is a bit of a meme translation, though, the original says 横長.)
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Kotoyama - Sharp WidthIf tkmiz's width is on the blobbiest end of the spectrum, then Kotoyama is the opposite: his wide faces are well-defined and extremely pointy. Eyes change from regular to rectangular (though as you can see in >>/jp/58098 it's not exclusive to widened forms), and noses disappear. Initially I had my doubts about including this one, as it is proportionally the narrowest of all, but after giving it a closer look I can say with no doubt that it fits Ume's criteria to a T, even if the change is not as pronounced as in Hidamari.
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