Ghost is one of the six direwolf cubs that the Starks found in the woods before the arrival of King Robert and his court at Winterfell. An albino with white fur and red eyes, he is an intelligent and quickly maturing animal.
Ghost has a thick white fur and red eyes, and Theon Greyjoy said he would die sooner than the others since he is an Albino, yet he didn't. Ghost was the only Direwolf to open its eyes while the others were still blind.
Jon has noted that Ghost's red eyes are similar to the faces on carved weirwood heart trees by the children of the forest. At the outset, Ghost is the smallest of his pack, but eventually he grows to be larger than his litter mates.
The Stark children find Ghost and his litter mates after their mother was killed by a stag. Jon Snow suggests that he should take Ghost since they are both outcasts in their own way: he is a bastard, and Ghost is an albino. The beast grows very quickly, and the two form a bond. Jon Snow later takes the young wolf with him to the Wall when he joins the Night's Watch.
Jon Snow begins to enter Ghost's body through a warg bond.
Jon sends Ghost back to Castle Black. When Jon returns, he and Ghost are reunited.
Ghost can sense the presence of his siblings, specifically Nymeria, who has come to lead a wolf pack on her own. Ghost later senses the betrayal of the Night's Watch, but is unable to help Jon when he is stabbed.