First up is Chihaya, the protagonist of Chihayafuru.
She has a very nice ponytail. To make it even better, she pretty much only ties up her hair for karuta matches. That’s dedication.
As a note on this, these posts aren’t going to be in any particular order. Except for #1. And no, it’s not going to be Aoi. Although it should be. I’m limiting this to characters who have ponytails for significant lengths of time. Unfortunately, Aoi only had hers briefly.