Changeling

That's what the zebra called him anyway.

He called himself Murex, he doesn't know why but it just feels... right.

He lives in a forest, a dangerous one at that but he gets by. He can fight off, even eventually kill, those big fur things with claws and weird tails but he doesn't go out of his way to.

Mustn't waste energy. That's what the zebra says anyway.

He was prowling the forest waiting for that burning ball of light to come but it never did.
Then six ponies entered the forest.
And his life was never the same again.