So y'know the hallway scene from 6x06 that's so quintessentially Brittana? The end of it, that is so wonderfully dorky!Brittana, was improvised by Heya (it wasn't scripted), and it makes me wonder how many other character traits we've come to associate with Brittana were created by Heya (never forgetting that Brittana was formed because of Heya improvising)
I saw that Q&A with Michael Hitchcock, and, I have to say, I’m not surprised the cute dialogue was improvised!
As you said, so much of the very best of Brittana over the years has come from Heya ad-libs, from some of the earliest pinky linking to “Stop the violence” to Brittany’s melancholic looks all through Season Four (which told us that, no matter what the script said, Baby Girl wasn’t into anything that was happening in Lima that year).
Obviously, without having access to every Glee script (and without knowing what kind of direction Heya might have received on-the-spot from directors, choreographers, producers, etc.), it’s impossible for us to say exactly how many of our favorite Brittana traits come from Heya improvisations as opposed to other sources.
—but my personal guess is “a lot,” as so much of Brittana is and has always been what happens between the lines (e.g., the looks, the little touches, the reactions, the held breaths and hesitations, the heat and energy and determination, the inflection of the lines).
Brittany, Santana, and Brittana have always been so much more than what the Glee scripts tried to allow them to be.
Thank Grilled Cheesus for Heather and Naya, who understood their characters and the relationship between their characters so well and with so much nuance!