Hmmm.
Mod S here! So I don’t really see Hank and Willow going hard core emo/edgelord/scene; even if it was in their personalities, Mabel would (not entirely on purpose) take the piss out of it by wholeheartedly and earnestly joining them in the hair-dying and bedecking of clothes in safety pins and generally making it NOT COOL ANYMORE.
(also, their uncle is a demon. they win at being edge forever)
That being said, if Hank and Willow went emo, Acacia would do the opposite of hiding it. No, she would be two steps behind them the whole time, glaring at every single person who even blinks at them wrong, and wearing a whole bunch of suspiciously heavy metal rings to school all the sudden.
There’s only one person who can make fun of her siblings, and that’s Acacia. Everyone else can put up or shut up.