The Horseman

The Horseman is a mysterious figure who haunts Jack's mind. It's not clear whether the Horseman is a real person, or another one of Jack's nightmarish hallucinations. He resembles a ghostly black silhouette of an armored samurai with glowing eyes riding a horse, surrounded by an ominous green fog. He has a deep, sepulchral voice.

Background
Nothing is known about the mysterious Horseman except that it stalks Jack during numerous points; It can be noted that it always appears whenever Jack has doubt or guilt in himself.

The Horseman firstly appears as Jack hallucinates his parents and a family of corpse-like people. The area becomes black and it appears with a ghastly green background; shocking Jack as it glances menacingly at him. The Horseman's second encounter happens as Jack is tormented by a flamed version hallucination of his Father, to which his signature horse noise alerts Jack to turn back and see the Horseman again imprinted on a rock.

In XCIII, The Horseman appears yet again as Jack hides inside the parts of a previously destroyed Beetlebot. As one of Jack's hallucinations of himself pleads with him to 'join his ancestors', Jack turns to look through the crack of the Beetlebot's shell, only to see green mist surrounding the area and the Horseman staring at him.

In XCIV, Jack (who is wounded heavily by the Daughters of Aku's attack) tries to find shelter only to turn around and notice the Horseman waiting for him. Jack choose to ignore the spectre but notices that it can move. Whilst Jack continues his search for shelter, The Horseman refuses to be ignored and continues to stalk Jack whilst still on Horseback, never taking his eyes off him.

In XCVI, The Horseman seemingly claims victory as he notices Jack's grief over the unconscious kidnapped children (who Jack mistakes for dead) and for the first time speaks to Jack, inviting him with the words "It is time". Jack, now broken complies with "yes" and follows the Horseman out of the factory; leaving Ashi all alone.