the kuroko joke killed me. i swear i've seen multiple other authors mansplain(manga-splain) about misdirection just like that pretending that they didn't all learn it from the exact same place
So my guess is she is I-cup, for the Eye=I pun.. since she is both covering her feature (which is her face specially her eyes) and her figure (which is an I-cup).
With the Second Season probably including her I hope the way they do this gag in the future is it zooms out and we see an office with artists drawing the scenes before Rentaro bursts in to change it or as the narrator finishes saying that line we here rentaro burst down the door to the recording booth