Emerald Evergreen is a most perplexing earth pony. He has a vast knowledge of the past that only immortals should know of. Despite claiming to be a crystal pony, Cadence has never heard of him.
It's one thing to create/throw already-established characters in a story of some kind. It's another thing to develop those characters, regardless of the situation they're in.
I love reading stories and I am a big fan of anthro & human ones the most.