A thought occurs. Apart from the Mane Six, would you have GMing games for the ponies? I typically think Mayor Mare would be a interesting idea for someone to be a gamemaster.

Lyra keeps introducing strange, misunderstood bipedal monsters into her games.

The Great and Powerful Trixie might be good at the story-telling aspect, and if she has gotten overn her ego problems enough she could be good in general.