Sometimes introverts come out of their shell when they're in their element. Honestly I think because Kson is so passionate about cosplay and video games, that she loves being "out and about" when she's at a convention and around those kinds of people. But, as far as going out in public in general she doesn't seem to be a fan unless she's with someone she absolutely trusts, like Kanata. I remember that one clip where Mio asked Coco why she doesn't wanna hang out w/ Subaru, and she said because the duck is way too extroverted and would make her "go out and do things,' lol.
But yeah there's different levels of introvert, and as you said, we know Pekora is waaaay at the social-anxiety end of the spectrum, poor girl.
Lastly, I agree with the girls having no reason to lie. Is there kayfabe in some of the stuff they do? Of course, they're entertainers; guarantee they exaggerate certain things a little bit, but I highly doubt they ever flat-out lie. No way they'd lie about their personal struggles though. I've even personally confirmed some of the stuff they've said through old archives of their 'past selves' (with some help). A lot of the Holos have had it really rough, and I'm very happy they can live full, successful lives now. Yagoo/Cover have done a lot of good for a lot of people.
Choco is definitely a master cook, she's shown it on dozens of occasions. I remember when 2nd Gen had their full-collab a couple months ago, all the girls begged her to cook omurice of all things, to which Choco commented that they're all like little kids, wanting something so simple to eat.
Choco is definitely the "nutrition mommy" of all the girls, whereas Mio is the "mental health mommy." They're both shoulders that most of the other Holos lean on when they need advice.
I just wish sensei would go the route Aki does and actually film what she's doing while she cooks. Aki's just careful not to show anything besides her hand/arm (and she wears a white glove so it looks like it's actually 'Aki' cooking it). I want someone to translate Choco's recipes and cooking streams but the one guy who does Choco translations said he's really not interested, sadly.
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At least the last dude didn't try to compare Vtubers to Jacksepticeye or Markiplier. He just said "lol they're gay" and left. I prefer that approach.