Name the idols you think act pretty much the same off-screen as they do on-screen

I mean the question seems redundant my friend since our often do we see idols "off camera" unless we personally know them or hear stories from their colleagues

in terms of the opposite - I know that Dahyun from twice is a lot more reserved than on camera since it has been mentioned multiple times by her fellow members

Quote from OopsEncoreMoi

It’s crazy when you really think about it, only few of them are brave enough to just act normal on camera

... we don't know that. The way most idols act on camera could easily be their normal. Many people like to assume they're legit acting every time we see them, but it's much more likely that they simply hide the less wholesome sides of themselves and refrain from saying certain things rather than inventing an entirely different persona. Otherwise I think what you see is what you get in most cases. There's a reason most idols don't actually go into acting, and even some of the ones who do aren't very good at it.