It is Arya. She's in a lot of the Teens React videos. She often seems more disconnected than any of the rest of them, which I guess makes sense.

It's interesting that the generation from the videos doesn't know anything about the NES, but I know there are younger kids that do. My kids have played NES because I have an NES. I guess there's a gap there where kids are too young to have played these things themselves, but often too old to have parents who grew up on it (parents in their 30's or so).