>>7769035 (OP)
Probably for reasons similar to why everyone did that shitty bean mouth design. You could just redraw the same shapes and proportions to get your character - when you look at a lot of anime characters, many have that 'mouth muzzle' thing going on, or even a side mouth, which not only lowers cost, but is significantly easier to draw or animate (which is the reason it lowers costs).
So I'm just guessing a character such as this is probably more difficult because she'd be quite different, not just from other jobs, from all other characters on the show because of her distinctive face and proportions (don't know what she's from though, so I'm assuming that's the case). It's simply easier to drawn a slightly modified version of other characters than something totally unique.