Ogie: From a Frog to a Prince!
I've just had a thought. If 'Waitress' is a fairytale, then the character of Ogie represents the Ugly Frog who is transformed into the Handsome Prince. The girl kisses the frog and breaks the spell that traps him in this loathsome form. In turn, the Prince takes the girl for his Princess and elevates her above all her peers.
This is a clear parallel of the manner in which the two saddest characters in the film - Dawn and Ogie - redeem eachother from a life of TV dinners-for-one and forge a truly happy relationship. Dawn is initially repelled by Ogie, but when she sees the good and kind man that lies beneath his nerdish exterior, she falls for him like a ton of bricks. There is not just one fairytale being told here - but two!
Damn, why didn't I think of it before?