Everyone keeps underestimating Bocchi. They think she probably has no charm, only to realize she doesn't even use any make-up and looks absolutely adorably cute in the clothes her mom buys for her (that she doesn't wear).
And because she's basically always wearing either a tracksuit or baggy shirts... Well... They don't know about her... other assets.
I so desperately want someone like Seika to see Bocchi dressed up all cutesy and nearly be knocked unconscious from cuteness overload only to realize it's actually Bocchi.