His name is Ghost Axkou Shadow or "Silent Fury" named by the ponies in Ponyville.
Many don't know alot about him except Princess Luna.She knows everything about Ghost and his past but She keeps silence when somepony ask about him.The mane six know ghost by just glimpses of his face when he around at night. He is alone in life and love because when King sombra was killed by the Elements of harmony He received King sombra's magic and he went into exile because he knew what powers he had to learn.

This is his story..