Sir Gawain is a young, highly respected knight of Arthur's court and the king's nephew. Deeply pious and courteous, he bears a shield emblazoned with a five-pointed star representing his five intact senses, five skillful fingers, and dedication to the five wounds of Christ. He demonstrates his loyalty by stepping forward to take King Arthur's place in a deadly game, volunteering to strike a mysterious visitor with his own ax.

The Green Knight is a massive, supernatural figure with green skin, green hair, and gold-embroidered clothing. He possesses a rowdy demeanor and issues a bizarre challenge to King Arthur's court to test their courage. Connected to the natural world and seasonal rebirth, he also operates a splendid castle in the wilderness, presenting himself as a generous, middle-aged host with a thick beaver-hued beard.

Lady Bertilak is the young, exceedingly beautiful wife of the lord who takes Gawain in during his travels. She acts as a courteous hostess, providing food, drink, and engaging conversation. Behind her traditional hospitality, she displays a quick wit and a bold understanding of courtly romance, actively challenging Gawain's dedication to his chivalric vows.

King Arthur is the youthful and somewhat restless ruler of Camelot. He values bravery, honor, and entertaining stories, setting a tone of festive gallantry at his court. When an unexpected visitor insults his knights, Arthur is the first to leap up in defense of his kingdom's reputation.

Morgan le Fay is an elderly, mysterious woman who commands immense respect at the wilderness castle. She is King Arthur's half-sister and a powerful enchantress with ties to pre-Christian magic. She observes the events at the castle from a position of quiet, unquestioned authority.

Guenevere is the exceptionally beautiful queen of Camelot. Surrounded by luxury, she represents the wealth, prestige, and somewhat sheltered decadence of Arthur's court. She watches the ensuing supernatural challenge from the safety of the royal dais.

Bishop Baldwin is a high-ranking member of the Church attending the winter festivities at Camelot. His presence at the king's side signifies the strong connection between religious authority and Arthur's royal court.

Merlin is a famous sorcerer connected to Arthurian legend. Though not physically present at the winter feasts, his past association with Camelot's extended family leaves a lingering magical influence on the world.

Gringolet is Sir Gawain's trusted horse. Strong and reliable, the steed carries the knight out of the safety of Arthur's kingdom and into the freezing, monster-filled wilderness of northern Wales.