And why is everyone online simping for her?
Actual answer: that's Komi-chan from "Komi Can't Communicate", which is a manga (and lately an anime) about a chick that is so autistic that she literally can't speak properly. The manga is about her inexplicably making friends despite this handicap.
She's the new poster-child for the Redditor manga/anime brigade because they can all relate to being socially-retarded weirdos that can't make friends normally, and if there's hope for a fictional autist girl, then maybe there's hope for all of them too. (That and the idea of a chick being so dependent on a guy that he has to do the talking for her also appeals to their virgin mindset.)