some modern female video game protagonists have some amount of chin, which indicates that they’re real and believable, and thus not meant for an audience of gamergate incels. the incels are outraged by it.

DEI (diversity, equity, inclusion) is a buzzphrase right wingers scream whenever someone with an uncomfortable amount of color in their skin or a woman makes it to a high position. they mean to say that the position is undeserved, that they only got it out of pity or quotas and not out of competence or merit.

combine the two and you get a female protagonist with a normal body that isn’t built to be a sex object for incels who doesn’t deserve the position she has.

"Jaw too big" is a VERY common gamer incel complaint for female characters. It was especially silly with the recent Silent Hill 2 remake, where they were complaining about Maria's appearance which is based off her voice actress.