"Greg" is an elderly janitor not many people know anything about. Some say he's the leader of a cult, others say he's a paranormal entity. Nobody ever sees him sees the school, and he almost always speaks in angry grumbling (Though he does occasionally speak up from time to time), and if you were to look at all the class photos since the school's founding you'll find him, the same as he is now. Nobody even knows his real name, everybody just calls him "Greg".