Tina would be the T-Dog of Glee.
She'd last 10 seasons just because they'd never bother giving her the screentime for a death scene.
Burt would be the T-Dog to Kurt's Carol, pinning two walkers to the wall like a boss while Kurt made a run for it (good luck getting very far in those skintight knee-high boots though, Kurt).
Sue would definitely be The Governor, btw. Though I could picture her and Roz Washington and Beiste battling it out for dominance in some wild Mad Max-style road battle.
Finn would try to shoot a walker and somehow manage to blow away himself.
Rachel would gaze out over the devastation and sing some tragic power ballad as the walkers close in on her.
Santana would be blowing walkers away like a mother****er, dragging Brittany along with her.