Who's the one in the back?

Lindsey sterling

I assumed that was her in the front, the person in back looked a bit more masculine.

Looks like one of the 2cellos folks but not 100% sure ( https://youtube.com/@2celloslive ) But couldn't find the video from the screenshot.

Ah I think your right, likely Stjepan Hauser. Good call

Henchman 1: "Is that... the Mission Impossible theme?" Henchman 2: "Sounds like. But where's it coming from?" Henchman 3 (who has henched before and survived it): "I don't hear shit."

BBEG = big bad evil guy?

Yes. Usually, unless your players are funny and you get gems 'big brained einstein genius' or 'big boned elephant guy'

Steven sharp Nelson [source](https://youtu.be/9p0BqUcQ7i0)

Giving a wrong answer on the internet is the best way to get the right answer