All four are essentially "non-human" characters. Ghost is a direwolf, companion to Jon Snow. Drogon is a dragon, one of three hatched to Daenerys Targaryen, the first born in hundreds of years. The Wights were once men, raised as thralls to the White Walkers. The Night King was also once a man, turned into a White Walker by the Children of the Forest to fight the First Men.
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